diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9f78898..f8076c2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,19 +7,6 @@ on:
       - master
 
 jobs:
-  Linting:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python 3.9
-        uses: actions/setup-python@v2
-        with:
-          python-version: 3.9
-      - name: Linting
-        run: |
-          pip install flake8
-          flake8 --ignore=W,E203,F405 --max-line-length=88 cfonts tests
   Testing:
     runs-on: ${{ matrix.os }}
     strategy:
@@ -34,7 +21,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
-        run: pdm install -d
+        run: pdm install
       - name: Run Tests
         run: |
           pdm run pytest tests
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..bcb5dcb
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,31 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  release-pypi:
+    name: release-pypi
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.8
+          architecture: "x64"
+      - name: Install build tool
+        run: |
+          pip install -U build
+      - name: Build artifacts
+        run: |
+          python -m build
+      - name: Test Build
+        run: |
+          pip install twine
+          twine check dist/*
+      - name: Upload to Pypi
+        run: |
+          twine upload --username __token__ --password ${{ secrets.PYPI_TOKEN }} dist/*
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..2e4f423
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,25 @@
+ci:
+  autoupdate_schedule: monthly
+repos:
+  - repo: https://github.com/psf/black
+    rev: 21.6b0
+    hooks:
+      - id: black
+        exclude: ^pdm/_vendor
+
+  - repo: https://github.com/PyCQA/flake8
+    rev: 3.9.2
+    hooks:
+      - id: flake8
+
+  - repo: https://github.com/pycqa/isort
+    rev: 5.8.0
+    hooks:
+      - id: isort
+
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v0.812
+    hooks:
+      - id: mypy
+        args: [cfonts]
+        pass_filenames: false
diff --git a/cfonts/__init__.py b/cfonts/__init__.py
index e7509df..fab4c3a 100644
--- a/cfonts/__init__.py
+++ b/cfonts/__init__.py
@@ -8,4 +8,4 @@
 """
 __all__ = ["say", "render"]
 
-from .core import say, render
+from .core import render, say
diff --git a/cfonts/cli.py b/cfonts/cli.py
index d397630..b746c2c 100644
--- a/cfonts/cli.py
+++ b/cfonts/cli.py
@@ -8,10 +8,11 @@
 """
 import argparse
 import sys
+from typing import List, Optional
 
-from .consts import *  # noqa
-from .core import say, render
+from . import consts
 from .__version__ import __version__
+from .core import render, say
 
 
 class CFontsArgumentParser(argparse.ArgumentParser):
@@ -26,7 +27,9 @@ def format_help(self) -> str:
         formatter.add_text(self.description)
 
         # usage
-        formatter.add_usage(self.usage, self._actions, self._mutually_exclusive_groups)
+        formatter.add_usage(
+            self.usage or "", self._actions, self._mutually_exclusive_groups
+        )
 
         # positionals, optionals and user-defined groups
         for action_group in self._action_groups:
@@ -42,7 +45,7 @@ def format_help(self) -> str:
         return formatter.format_help()
 
 
-def parse_args():
+def parse_args() -> argparse.Namespace:
     parser = CFontsArgumentParser(
         "cfonts",
         description="This is a tool for sexy fonts in the console. "
@@ -60,24 +63,28 @@ def parse_args():
     parser.add_argument(
         "-f",
         "--font",
-        default=FONTFACES.block,
-        choices=FONTFACES.all(),
+        default=consts.FontFaces.block,
+        choices=consts.FontFaces,
+        type=consts.FontFaces,
         help="Use to define the font face",
     )
     parser.add_argument(
-        "-c", "--colors", default=COLORS.system, help="Use to define the font color"
+        "-c",
+        "--colors",
+        default=consts.Colors.system.value,
+        help="Use to define the font color",
     )
     parser.add_argument(
         "-b",
         "--background",
-        default=BGCOLORS.transparent,
+        default=consts.BgColors.transparent.value,
         help="Use to define the background color",
     )
     parser.add_argument(
         "-a",
         "--align",
         default="left",
-        choices=ALIGNMENT,
+        choices=consts.ALIGNMENT,
         help="Use to align the text output",
     )
     parser.add_argument(
@@ -130,16 +137,16 @@ def parse_args():
     return args
 
 
-def main():
+def main() -> None:
     args = parse_args()
 
     colors = [c.strip() for c in args.colors.split(",")]
     if args.gradient:
-        gradient = [g.strip() for g in args.gradient.split(",")]
+        gradient: Optional[List[str]] = [g.strip() for g in args.gradient.split(",")]
     else:
         gradient = None
     options = {
-        "font": args.font,
+        "font": args.font.value,
         "colors": colors,
         "background": args.background,
         "align": args.align,
diff --git a/cfonts/colors.py b/cfonts/colors.py
index 5ec45dd..30ede93 100644
--- a/cfonts/colors.py
+++ b/cfonts/colors.py
@@ -1,105 +1,75 @@
 """
 Utility functions for handling terminal colors
 """
-from __future__ import division
+import colorsys
 import os
-from collections import namedtuple
+from typing import Iterable, List, Mapping, NamedTuple, Tuple
 
 from .consts import ANSI_COLORS, ANSI_RGB
 
-Style = namedtuple("Style", "open,close")
 
+class Style(NamedTuple):
+    open: str
+    close: str
 
-def hex_to_rgb(hex_string):
+
+_Rgb = Tuple[int, int, int]
+_Hsv = Tuple[float, float, float]
+
+
+def hex_to_rgb(hex_string: str) -> _Rgb:
     """Return a tuple of red, green and blue components for the color
     given as #rrggbb.
     """
     assert len(hex_string) in (4, 7), "Hex color format is not correct."
     if len(hex_string) == 4:
-        return tuple(int(c * 2, 16) for c in hex_string[1:])
-    return tuple(int(hex_string[i : i + 2], 16) for i in range(1, len(hex_string), 2))
+        return tuple(int(c * 2, 16) for c in hex_string[1:])  # type: ignore
+    return tuple(
+        int(hex_string[i : i + 2], 16) for i in range(1, len(hex_string), 2)
+    )  # type: ignore
 
 
-def rgb_to_hex(rgb):
+def rgb_to_hex(rgb: _Rgb) -> str:
     return "#" + "".join("%02x" % c for c in rgb)
 
 
-def rgb_to_hsv(rgb):
-    r, g, b = rgb
-    r /= 255
-    g /= 255
-    b /= 255
-
-    max_value = max(r, g, b)
-    min_value = min(r, g, b)
-    diff = max_value - min_value
-
-    h, s, v = 0, diff / max_value if max_value > 0 else 0, max_value
-
-    if max_value == min_value:
-        h = 0
-    elif max_value == r:
-        h = 60 * (g - b) / diff
-        if g < b:
-            h += 360
-    elif max_value == g:
-        h = 60 * (b - r) / diff + 120
-    else:
-        h = 60 * (r - g) / diff + 240
-
-    return h, (s * 100), (v * 100)
-
-
-def hsv_to_rgb(hsv):
-    h, s, v = hsv
-    h /= 60
-    s /= 100
-    v /= 100
-    hi = int(h) % 6
+def rgb_to_hsv(rgb: _Rgb) -> _Hsv:
+    return colorsys.rgb_to_hsv(*rgb)
 
-    f = h - int(h)
-    p = 255 * v * (1 - s)
-    q = 255 * v * (1 - (s * f))
-    t = 255 * v * (1 - (s * (1 - f)))
-    v *= 255
 
-    result = {
-        0: (v, t, p),
-        1: (q, v, p),
-        2: (p, v, t),
-        3: (p, q, v),
-        4: (t, p, v),
-        5: (v, p, q),
-    }[hi]
-    return tuple(int(c) for c in result)
+def hsv_to_rgb(hsv: _Hsv) -> _Rgb:
+    return tuple(int(c) for c in colorsys.hsv_to_rgb(*hsv))  # type: ignore
 
 
-def _color_distance(left, right):
+def _color_distance(left: _Hsv, right: _Hsv) -> float:
     return sum((i - j) ** 2 for i, j in zip(left, right))
 
 
-def _ensure_rgb(color):
+def _ensure_rgb(color: str) -> _Rgb:
     if color in ANSI_RGB:
         return ANSI_RGB[color]
     return hex_to_rgb(color)
 
 
-def get_closest(rgb, rgb_map=ANSI_RGB):
+def get_closest(rgb: _Rgb, rgb_map: Mapping[str, _Rgb] = ANSI_RGB) -> str:
     """Return the closest ANSI color name from the given RGB."""
-    color = min(rgb_map.items(), key=lambda x: _color_distance(rgb, x[1]))
-    return color[0]
+    return min(rgb_map, key=lambda name: _color_distance(rgb, rgb_map[name]))
 
 
-def get_linear(start, end, steps):
+def get_linear(start: float, end: float, steps: int) -> List[float]:
     """Get a list of numbers interpolated from start to end inclusively."""
     step = (end - start) / (steps - 1)
     return [start + i * step for i in range(steps)]
 
 
-def get_interpolated_hsv(start_hsv, end_hsv, steps, transition=False):
+def get_interpolated_hsv(
+    start_hsv: _Hsv, end_hsv: _Hsv, steps: int, transition: bool = False
+) -> Iterable[_Hsv]:
     """Get a sequence of HSV colors interpolated from start to end"""
     if transition:
-        return zip(*[get_linear(s, e, steps) for s, e in zip(start_hsv, end_hsv)])
+        return zip(
+            *[get_linear(s, e, steps) for s, e in zip(start_hsv, end_hsv)]
+        )  # type: ignore
     s_sequence = get_linear(start_hsv[1], end_hsv[1], steps)
     v_sequence = get_linear(start_hsv[2], end_hsv[2], steps)
     start_h, end_h = start_hsv[0], end_hsv[0]
@@ -119,7 +89,7 @@ class AnsiPen:
     CLOSE_BIT = "\x1b[39m"
     BG_CLOSE_BIT = "\x1b[49m"
 
-    def style(self, color, background=False):
+    def style(self, color: str, background: bool = False) -> Style:
         if color == "system":
             return Style("", "")
         if color in ANSI_COLORS:
@@ -128,31 +98,33 @@ def style(self, color, background=False):
             return self.hex_style(color, background)
         raise ValueError("Unsupported color: {}".format(color))
 
-    def ansi_style(self, color, background):
+    def ansi_style(self, color: str, background: bool) -> Style:
         offset = 10 if background else 0
         close = self.BG_CLOSE_BIT if background else self.CLOSE_BIT
         code = ANSI_COLORS[color]
         return Style("\x1b[{}m".format(offset + code), close)
 
-    def hex_style(self, color, background):
+    def hex_style(self, color: str, background: bool) -> Style:
         return self.rgb_style(hex_to_rgb(color), background)
 
-    def rgb_style(self, color, background):
+    def rgb_style(self, color: _Rgb, background: bool) -> Style:
         ansi_color = get_closest(color)
         return self.ansi_style(ansi_color, background)
 
-    def get_gradient(self, colors, steps, transition=False):
+    def get_gradient(
+        self, colors: List[str], steps: int, transition: bool = False
+    ) -> List[Style]:
         if transition and len(colors) < 2:
             raise ValueError("Transition gradient needs at least two colors")
         elif not transition and len(colors) != 2:
             raise ValueError("Gradient needs exactly two colors")
-        colors = [_ensure_rgb(color) for color in colors]
-        color_steps = [(steps - 1) // (len(colors) - 1)] * (len(colors) - 1)
+        rgb_colors = [_ensure_rgb(color) for color in colors]
+        color_steps = [(steps - 1) // (len(rgb_colors) - 1)] * (len(rgb_colors) - 1)
         if sum(color_steps) < (steps - 1):
             color_steps[-1] += 1
         assert sum(color_steps) == steps - 1
-        result = []
-        for start, end, st in zip(colors, colors[1:], color_steps):
+        result: List[Style] = []
+        for start, end, st in zip(rgb_colors, rgb_colors[1:], color_steps):
             start_hsv, end_hsv = rgb_to_hsv(start), rgb_to_hsv(end)
             styles = [
                 hsv_to_rgb(hsv)
@@ -168,11 +140,11 @@ def get_gradient(self, colors, steps, transition=False):
 
 
 class TrueColorPen(AnsiPen):
-    def rgb_style(self, color, background):
+    def rgb_style(self, color: _Rgb, background: bool) -> Style:
         open_bit = 48 if background else 38
         close = self.BG_CLOSE_BIT if background else self.CLOSE_BIT
         r, g, b = color
-        return Style("\x01\x1b[{};2;{};{};{}m".format(open_bit, r, g, b), close)
+        return Style("\x1b[{};2;{};{};{}m".format(open_bit, r, g, b), close)
 
 
 if (os.getenv("DISABLE_TRUECOLOR") or os.name == "nt") and not os.getenv(
diff --git a/cfonts/consts.py b/cfonts/consts.py
index 33d84e7..8a80ae1 100644
--- a/cfonts/consts.py
+++ b/cfonts/consts.py
@@ -6,21 +6,15 @@
     :license: GNU GPLv2
     :author: Frost Ming<mianghong@gmail.com>
 """
+import enum
 from shutil import get_terminal_size
+from typing import Mapping, Tuple
 
-SIZE = tuple(get_terminal_size((80, 24)))
+SIZE = get_terminal_size((80, 24))
 CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789|!?.+-_=@#$%&()/:;,' \""
 
 
-class Enum:
-    @classmethod
-    def all(cls):
-        return [
-            v for k, v in cls.__dict__.items() if not k.startswith("_") and k != "all"
-        ]
-
-
-class COLORS(Enum):
+class Colors(enum.Enum):
     system = "system"
     black = "black"
     red = "red"
@@ -40,7 +34,7 @@ class COLORS(Enum):
     bright_white = "bright_white"
 
 
-class CANDYCOLORS(Enum):
+class CandyColors(enum.Enum):
     red = "red"
     green = "green"
     yellow = "yellow"
@@ -56,7 +50,7 @@ class CANDYCOLORS(Enum):
     bright_cyan = "bright_cyan"
 
 
-class BGCOLORS(Enum):
+class BgColors(enum.Enum):
     transparent = "transparent"
     black = "black"
     red = "red"
@@ -79,7 +73,7 @@ class BGCOLORS(Enum):
 ALIGNMENT = ["left", "center", "right"]
 
 
-class FONTFACES(Enum):
+class FontFaces(enum.Enum):
     console = "console"
     block = "block"
     simpleblock = "simpleBlock"
@@ -114,7 +108,7 @@ class FONTFACES(Enum):
     "bright_white": 97,
 }
 
-ANSI_RGB = {
+ANSI_RGB: Mapping[str, Tuple[int, int, int]] = {
     "black": (0, 0, 0),
     "red": (127, 0, 0),
     "green": (0, 127, 0),
diff --git a/cfonts/core.py b/cfonts/core.py
index e7746df..ff991ed 100644
--- a/cfonts/core.py
+++ b/cfonts/core.py
@@ -11,28 +11,35 @@
 import pkgutil
 import random
 import re
+from typing import List, Mapping, Optional, Tuple
 
 import colorama
 
-from .consts import ALIGNMENT, BGCOLORS, CANDYCOLORS, CHARS, COLORS, FONTFACES, SIZE
 from .colors import pen
+from .consts import ALIGNMENT, CHARS, SIZE, BgColors, CandyColors, Colors, FontFaces
 
 colorama.init()
 
 
 class Font:
-    def __init__(self, name):
+    colors: int
+    lines: int
+    buffer: List[str]
+    letterspace: List[str]
+    chars: Mapping[str, List[str]]
+
+    def __init__(self, name: str) -> None:
         self.name = name
-        if name == FONTFACES.console:
+        if name == FontFaces.console.value:
             self.colors = 1
             self.lines = 1
             return
-        font_face = json.loads(
-            pkgutil.get_data(__package__, "fonts/{}.json".format(name)).decode("utf-8")
-        )
+        metadata = pkgutil.get_data(__package__, "fonts/{}.json".format(name))
+        assert metadata
+        font_face = json.loads(metadata.decode("utf-8"))
         self.__dict__.update(font_face)
 
-    def add_letter_spacing(self, output, letter_spacing):
+    def add_letter_spacing(self, output: List[str], letter_spacing: int) -> List[str]:
         lines = len(output) - self.lines
         for i in range(lines, len(output)):
             idx = i - lines
@@ -40,7 +47,7 @@ def add_letter_spacing(self, output, letter_spacing):
             output[i] += space * letter_spacing
         return output
 
-    def add_char(self, output, char):
+    def add_char(self, output: List[str], char: str) -> List[str]:
         lines = len(output) - self.lines
         for i in range(lines, len(output)):
             idx = i - lines
@@ -48,7 +55,7 @@ def add_char(self, output, char):
         return output
 
 
-def add_line(output, buffer, line_height):
+def add_line(output: List[str], buffer: List[str], line_height: int) -> List[str]:
     """Add a new line to the output array.
 
     :param output: The output array the line shall be appended to
@@ -65,7 +72,7 @@ def add_line(output, buffer, line_height):
     return output
 
 
-def get_font(font):
+def get_font(font: str) -> Font:
     """Get a selected JSON font-file object.
 
     :param font: The name of the font to be returned
@@ -75,7 +82,7 @@ def get_font(font):
     return Font(font)
 
 
-def clean_input(text, allowed_chars=CHARS):
+def clean_input(text: str, allowed_chars: str = CHARS) -> str:
     """Filter only allowed characters.
 
     :param text: The input text to be filtered
@@ -85,7 +92,7 @@ def clean_input(text, allowed_chars=CHARS):
     return "".join(c for c in text if c.upper() in allowed_chars)
 
 
-def char_length(character, letter_spacing=0):
+def char_length(character: List[str], letter_spacing: int = 0) -> int:
     """Return the max width of a character by looking at its longest line.
 
     :param character: The character array from the font face
@@ -101,7 +108,13 @@ def char_length(character, letter_spacing=0):
     return char_width
 
 
-def align_text(output, line_length, character_lines, align, size=SIZE):
+def align_text(
+    output: List[str],
+    line_length: int,
+    character_lines: int,
+    align: str,
+    size: Tuple[int, int] = SIZE,
+) -> List[str]:
     assert align in ALIGNMENT
     space = 0
     if align == "center":
@@ -115,15 +128,15 @@ def align_text(output, line_length, character_lines, align, size=SIZE):
     return output
 
 
-def colorize(line, font_colors, colors):
+def colorize(line: str, font_colors: int, colors: List[str]) -> str:
     if font_colors > 1:
         for i in range(font_colors):
             try:
                 color = colors[i]
             except IndexError:
-                color = COLORS.system
-            if color == COLORS.candy:
-                color = random.choice(CANDYCOLORS.all())
+                color = Colors.system.value
+            if color == Colors.candy.value:
+                color = random.choice(list(CandyColors)).value
             style = pen.style(color, False)
             line = re.sub("<c{}>".format(i + 1), style.open, line)
             line = re.sub("</c{}>".format(i + 1), style.close, line)
@@ -131,18 +144,23 @@ def colorize(line, font_colors, colors):
         try:
             color = colors[0]
         except IndexError:
-            color = COLORS.system
-        if color == COLORS.candy:
-            color = random.choice(CANDYCOLORS.all())
+            color = Colors.system.value
+        if color == Colors.candy.value:
+            color = random.choice(list(CandyColors)).value
         style = pen.style(color, False)
         line = style.open + re.sub(r"</?c\d+>", "", line) + style.close
     return line
 
 
 def render_console(
-    text, size=SIZE, colors=[], align="left", letter_spacing=None, line_height=1
-):
-    output = []
+    text: str,
+    size: Tuple[int, int] = SIZE,
+    colors: List[str] = [],
+    align: str = "left",
+    letter_spacing: Optional[int] = None,
+    line_height: int = 1,
+) -> List[str]:
+    output: List[str] = []
     i = 0
     letter_spacing = max((letter_spacing or 1) - 1, 0)
     line_height = max(line_height - 1, 0)
@@ -157,7 +175,7 @@ def render_console(
         if len(line) > size[0]:
             output_lines[i : i + 1] = line[: size[0]].strip(), line[size[0] :].strip()
             line = output_lines[i]
-        if len(colors) > 0 and colors[0] == COLORS.candy:
+        if len(colors) > 0 and colors[0] == Colors.candy.value:
             output.append("".join(colorize(c, 1, colors) for c in line))
         else:
             output.append(line)
@@ -170,20 +188,26 @@ def render_console(
     return output
 
 
-def _find_left_most_non_space(line):
+def _find_left_most_non_space(line: str) -> int:
     return min(i for i, c in enumerate(line) if c.strip() != "")
 
 
-def _find_right_most_non_space(line):
+def _find_right_most_non_space(line: str) -> int:
     return max(i for i, c in enumerate(line) if c.strip() != "")
 
 
 def paint_gradient(
-    output, gradient, independent_gradient, lines, font_lines, line_height, transition
-):
+    output: List[str],
+    gradient: List[str],
+    independent_gradient: bool,
+    lines: int,
+    font_lines: int,
+    line_height: int,
+    transition: bool,
+) -> List[str]:
     """Apply gradient colors to output"""
     if independent_gradient:
-        buffer = []
+        buffer: List[str] = []
         start = 0
         for _ in range(lines):
             temp = output[start : start + font_lines]
@@ -199,7 +223,7 @@ def paint_gradient(
     min_index = min(_find_left_most_non_space(line) for line in output if line.strip())
     max_index = max(_find_right_most_non_space(line) for line in output if line.strip())
     styles = pen.get_gradient(gradient, max_index - min_index + 1, transition)
-    new_output = []
+    new_output: List[str] = []
     for line in output:
         if not line.strip():
             new_output.append(line)
@@ -214,20 +238,20 @@ def paint_gradient(
 
 
 def render(
-    text,
-    font=FONTFACES.block,
-    size=SIZE,
-    colors=None,
-    background=BGCOLORS.transparent,
-    align="left",
-    letter_spacing=None,
-    line_height=1,
-    space=True,
-    max_length=0,
-    gradient=None,
-    independent_gradient=False,
-    transition=False,
-):
+    text: str,
+    font: str = FontFaces.block.value,
+    size: Tuple[int, int] = SIZE,
+    colors: Optional[List[str]] = None,
+    background: str = BgColors.transparent.value,
+    align: str = "left",
+    letter_spacing: Optional[int] = None,
+    line_height: int = 1,
+    space: bool = True,
+    max_length: int = 0,
+    gradient: Optional[List[str]] = None,
+    independent_gradient: bool = False,
+    transition: bool = False,
+) -> str:
     """Main function to get the colored output for a string.
 
     :param text: the string you want to render
@@ -249,9 +273,9 @@ def render(
     colors = colors or []
     if colors and colors[0] != "system" and gradient:
         raise argparse.ArgumentError(
-            "colors and gradient cannot be specified at the same time."
+            None, "colors and gradient cannot be specified at the same time."
         )
-    if font == FONTFACES.console:
+    if font == FontFaces.console.value:
         # console fontface is pretty easy to process
         output = render_console(
             text,
@@ -326,7 +350,7 @@ def render(
     if space:
         # Blank lines at the beginning and end
         output = [""] * 2 + output + [""] * 2
-    if background != BGCOLORS.transparent:
+    if background != BgColors.transparent.value:
         # Fill whitespaces to the full width.
         # See https://github.com/frostming/python-cfonts/issues/3
         output = [(line + " " * (size[0] - len(_strip_color(line)))) for line in output]
@@ -337,7 +361,7 @@ def render(
     return "\n".join(output)
 
 
-def say(text, **options):
+def say(text: str, **options) -> None:
     """Render and write the output to stout.
 
     :param text: the string you want to render
@@ -349,6 +373,6 @@ def say(text, **options):
         print(write)
 
 
-def _strip_color(text):
+def _strip_color(text: str) -> str:
     regex = re.compile(r"\x1b\[\d+?m")
     return regex.sub("", text)
diff --git a/cfonts/py.typed b/cfonts/py.typed
new file mode 100644
index 0000000..e69de29
diff --git a/docs/conf.py b/docs/conf.py
index 3e04c65..4bd4697 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -23,14 +23,14 @@
 
 # -- Project information -----------------------------------------------------
 
-project = 'python-cfonts'
-copyright = '2018, Frost Ming'
-author = 'Frost Ming'
+project = "python-cfonts"
+copyright = "2018, Frost Ming"
+author = "Frost Ming"
 
 # The short X.Y version
-version = about['__version__']
+version = about["__version__"]
 # The full version, including alpha/beta/rc tags
-release = about['__version__']
+release = about["__version__"]
 
 
 # -- General configuration ---------------------------------------------------
@@ -47,16 +47,16 @@
 ]
 
 # Add any paths that contain templates here, relative to this directory.
-templates_path = ['_templates']
+templates_path = ["_templates"]
 
 # The suffix(es) of source filenames.
 # You can specify multiple suffix as a list of string:
 #
 # source_suffix = ['.rst', '.md']
-source_suffix = '.rst'
+source_suffix = ".rst"
 
 # The master toctree document.
-master_doc = 'index'
+master_doc = "index"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
@@ -68,10 +68,10 @@
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This pattern also affects html_static_path and html_extra_path .
-exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+exclude_patterns = ["_build", "Thumbs.db", ".DS_Store"]
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = "sphinx"
 
 
 # -- Options for HTML output -------------------------------------------------
@@ -79,7 +79,7 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'alabaster'
+html_theme = "alabaster"
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
@@ -90,7 +90,7 @@
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+html_static_path = ["_static"]
 
 # Custom sidebar templates, must be a dictionary that maps document names
 # to template names.
@@ -101,15 +101,14 @@
 # 'searchbox.html']``.
 #
 html_sidebars = {
-    "*": ['sidebarintro.html', 'localtoc.html', 'relations.html',
-          'sourcelink.html']
+    "*": ["sidebarintro.html", "localtoc.html", "relations.html", "sourcelink.html"]
 }
 
 
 # -- Options for HTMLHelp output ---------------------------------------------
 
 # Output file base name for HTML help builder.
-htmlhelp_basename = 'python-cfontsdoc'
+htmlhelp_basename = "python-cfontsdoc"
 
 
 # -- Options for LaTeX output ------------------------------------------------
@@ -118,15 +117,12 @@
     # The paper size ('letterpaper' or 'a4paper').
     #
     # 'papersize': 'letterpaper',
-
     # The font size ('10pt', '11pt' or '12pt').
     #
     # 'pointsize': '10pt',
-
     # Additional stuff for the LaTeX preamble.
     #
     # 'preamble': '',
-
     # Latex figure (float) alignment
     #
     # 'figure_align': 'htbp',
@@ -136,8 +132,13 @@
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-    (master_doc, 'python-cfonts.tex', 'python-cfonts Documentation',
-     'Frost Ming', 'manual'),
+    (
+        master_doc,
+        "python-cfonts.tex",
+        "python-cfonts Documentation",
+        "Frost Ming",
+        "manual",
+    ),
 ]
 
 
@@ -145,10 +146,7 @@
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
-man_pages = [
-    (master_doc, 'python-cfonts', 'python-cfonts Documentation',
-     [author], 1)
-]
+man_pages = [(master_doc, "python-cfonts", "python-cfonts Documentation", [author], 1)]
 
 
 # -- Options for Texinfo output ----------------------------------------------
@@ -157,7 +155,13 @@
 # (source start file, target name, title, author,
 #  dir menu entry, description, category)
 texinfo_documents = [
-    (master_doc, 'python-cfonts', 'python-cfonts Documentation',
-     author, 'python-cfonts', 'One line description of project.',
-     'Miscellaneous'),
+    (
+        master_doc,
+        "python-cfonts",
+        "python-cfonts Documentation",
+        author,
+        "python-cfonts",
+        "One line description of project.",
+        "Miscellaneous",
+    ),
 ]
diff --git a/pdm.lock b/pdm.lock
index 32d8658..f2297be 100644
--- a/pdm.lock
+++ b/pdm.lock
@@ -1,26 +1,24 @@
 [[package]]
 name = "alabaster"
-sections = ["dev"]
 version = "0.7.12"
 summary = "A configurable sidebar-enabled Sphinx theme"
 
 [[package]]
 name = "atomicwrites"
-sections = ["dev"]
 version = "1.4.0"
-marker = "sys_platform == 'win32'"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 summary = "Atomic file writes."
 
 [[package]]
 name = "attrs"
-sections = ["dev"]
 version = "21.2.0"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
 summary = "Classes Without Boilerplate"
 
 [[package]]
 name = "babel"
-sections = ["dev"]
 version = "2.9.1"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 summary = "Internationalization utilities"
 dependencies = [
     "pytz>=2015.7",
@@ -28,94 +26,90 @@ dependencies = [
 
 [[package]]
 name = "certifi"
-sections = ["dev"]
-version = "2020.12.5"
+version = "2021.5.30"
 summary = "Python package for providing Mozilla's CA Bundle."
 
 [[package]]
 name = "chardet"
-sections = ["dev"]
 version = "4.0.0"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
 summary = "Universal encoding detector for Python 2 and 3"
 
 [[package]]
 name = "colorama"
-sections = ["default", "dev"]
 version = "0.4.4"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
 summary = "Cross-platform colored terminal text."
 
 [[package]]
 name = "docutils"
-sections = ["dev"]
 version = "0.17.1"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
 summary = "Docutils -- Python Documentation Utilities"
 
 [[package]]
 name = "flake8"
-sections = ["dev"]
 version = "3.9.2"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
 summary = "the modular source code checker: pep8 pyflakes and co"
 dependencies = [
-    "pyflakes<2.4.0,>=2.3.0",
-    "pycodestyle<2.8.0,>=2.7.0",
-    "mccabe<0.7.0,>=0.6.0",
     "importlib-metadata; python_version < \"3.8\"",
+    "mccabe<0.7.0,>=0.6.0",
+    "pycodestyle<2.8.0,>=2.7.0",
+    "pyflakes<2.4.0,>=2.3.0",
 ]
 
 [[package]]
 name = "idna"
-sections = ["dev"]
 version = "2.10"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 summary = "Internationalized Domain Names in Applications (IDNA)"
 
 [[package]]
 name = "imagesize"
-sections = ["dev"]
 version = "1.2.0"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 summary = "Getting image size from png/jpeg/jpeg2000/gif file"
 
 [[package]]
 name = "importlib-metadata"
-sections = ["dev"]
-version = "4.0.1"
-marker = "python_version < '3.8'"
+version = "4.5.0"
+requires_python = ">=3.6"
 summary = "Read metadata from Python packages"
 dependencies = [
-    "zipp>=0.5",
     "typing-extensions>=3.6.4; python_version < \"3.8\"",
+    "zipp>=0.5",
 ]
 
 [[package]]
 name = "iniconfig"
-sections = ["dev"]
 version = "1.1.1"
 summary = "iniconfig: brain-dead simple config-ini parsing"
 
 [[package]]
 name = "Jinja2"
-sections = ["dev"]
-version = "2.11.3"
+version = "3.0.1"
+requires_python = ">=3.6"
 summary = "A very fast and expressive template engine."
 dependencies = [
-    "MarkupSafe>=0.23",
+    "MarkupSafe>=2.0",
 ]
 
 [[package]]
 name = "MarkupSafe"
-sections = ["dev"]
-version = "1.1.1"
+version = "2.0.1"
+requires_python = ">=3.6"
 summary = "Safely add untrusted strings to HTML/XML markup."
 
 [[package]]
 name = "mccabe"
-sections = ["dev"]
 version = "0.6.1"
 summary = "McCabe checker, plugin for flake8"
 
 [[package]]
 name = "packaging"
-sections = ["dev"]
 version = "20.9"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 summary = "Core utilities for Python packages"
 dependencies = [
     "pyparsing>=2.0.2",
@@ -123,8 +117,8 @@ dependencies = [
 
 [[package]]
 name = "pluggy"
-sections = ["dev"]
 version = "0.13.1"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 summary = "plugin and hook calling mechanisms for python"
 dependencies = [
     "importlib-metadata>=0.12; python_version < \"3.8\"",
@@ -132,171 +126,165 @@ dependencies = [
 
 [[package]]
 name = "py"
-sections = ["dev"]
 version = "1.10.0"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 summary = "library with cross-python path, ini-parsing, io, code, log facilities"
 
 [[package]]
 name = "pycodestyle"
-sections = ["dev"]
 version = "2.7.0"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 summary = "Python style guide checker"
 
 [[package]]
 name = "pyflakes"
-sections = ["dev"]
 version = "2.3.1"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 summary = "passive checker of Python programs"
 
 [[package]]
 name = "Pygments"
-sections = ["dev"]
 version = "2.9.0"
+requires_python = ">=3.5"
 summary = "Pygments is a syntax highlighting package written in Python."
 
 [[package]]
 name = "pyparsing"
-sections = ["dev"]
 version = "2.4.7"
+requires_python = ">=2.6,!=3.0.*,!=3.1.*,!=3.2.*"
 summary = "Python parsing module"
 
 [[package]]
 name = "pytest"
-sections = ["dev"]
 version = "6.2.4"
+requires_python = ">=3.6"
 summary = "pytest: simple powerful testing with Python"
 dependencies = [
+    "atomicwrites>=1.0; sys_platform == \"win32\"",
     "attrs>=19.2.0",
+    "colorama; sys_platform == \"win32\"",
+    "importlib-metadata>=0.12; python_version < \"3.8\"",
     "iniconfig",
     "packaging",
     "pluggy<1.0.0a1,>=0.12",
     "py>=1.8.2",
     "toml",
-    "importlib-metadata>=0.12; python_version < \"3.8\"",
-    "atomicwrites>=1.0; sys_platform == \"win32\"",
-    "colorama; sys_platform == \"win32\"",
 ]
 
 [[package]]
 name = "pytz"
-sections = ["dev"]
 version = "2021.1"
 summary = "World timezone definitions, modern and historical"
 
 [[package]]
 name = "requests"
-sections = ["dev"]
 version = "2.25.1"
+requires_python = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
 summary = "Python HTTP for Humans."
 dependencies = [
+    "certifi>=2017.4.17",
     "chardet<5,>=3.0.2",
     "idna<3,>=2.5",
     "urllib3<1.27,>=1.21.1",
-    "certifi>=2017.4.17",
 ]
 
 [[package]]
 name = "setuptools"
-sections = ["dev"]
-version = "56.2.0"
+version = "57.0.0"
+requires_python = ">=3.6"
 summary = "Easily download, build, install, upgrade, and uninstall Python packages"
 
 [[package]]
 name = "snowballstemmer"
-sections = ["dev"]
 version = "2.1.0"
 summary = "This package provides 29 stemmers for 28 languages generated from Snowball algorithms."
 
 [[package]]
 name = "sphinx"
-sections = ["dev"]
-version = "4.0.1"
+version = "4.0.2"
+requires_python = ">=3.6"
 summary = "Python documentation generator"
 dependencies = [
-    "sphinxcontrib-applehelp",
-    "sphinxcontrib-devhelp",
-    "sphinxcontrib-jsmath",
-    "sphinxcontrib-htmlhelp",
-    "sphinxcontrib-serializinghtml",
-    "sphinxcontrib-qthelp",
-    "Jinja2<3.0,>=2.3",
-    "MarkupSafe<2.0",
+    "Jinja2>=2.3",
     "Pygments>=2.0",
-    "docutils<0.18,>=0.14",
-    "snowballstemmer>=1.1",
-    "babel>=1.3",
     "alabaster<0.8,>=0.7",
+    "babel>=1.3",
+    "colorama>=0.3.5; sys_platform == \"win32\"",
+    "docutils<0.18,>=0.14",
     "imagesize",
+    "packaging",
     "requests>=2.5.0",
     "setuptools",
-    "packaging",
-    "colorama>=0.3.5; sys_platform == \"win32\"",
+    "snowballstemmer>=1.1",
+    "sphinxcontrib-applehelp",
+    "sphinxcontrib-devhelp",
+    "sphinxcontrib-htmlhelp",
+    "sphinxcontrib-jsmath",
+    "sphinxcontrib-qthelp",
+    "sphinxcontrib-serializinghtml",
 ]
 
 [[package]]
 name = "sphinxcontrib-applehelp"
-sections = ["dev"]
 version = "1.0.2"
+requires_python = ">=3.5"
 summary = "sphinxcontrib-applehelp is a sphinx extension which outputs Apple help books"
 
 [[package]]
 name = "sphinxcontrib-devhelp"
-sections = ["dev"]
 version = "1.0.2"
+requires_python = ">=3.5"
 summary = "sphinxcontrib-devhelp is a sphinx extension which outputs Devhelp document."
 
 [[package]]
 name = "sphinxcontrib-htmlhelp"
-sections = ["dev"]
-version = "1.0.3"
+version = "2.0.0"
+requires_python = ">=3.6"
 summary = "sphinxcontrib-htmlhelp is a sphinx extension which renders HTML help files"
 
 [[package]]
 name = "sphinxcontrib-jsmath"
-sections = ["dev"]
 version = "1.0.1"
+requires_python = ">=3.5"
 summary = "A sphinx extension which renders display math in HTML via JavaScript"
 
 [[package]]
 name = "sphinxcontrib-qthelp"
-sections = ["dev"]
 version = "1.0.3"
+requires_python = ">=3.5"
 summary = "sphinxcontrib-qthelp is a sphinx extension which outputs QtHelp document."
 
 [[package]]
 name = "sphinxcontrib-serializinghtml"
-sections = ["dev"]
-version = "1.1.4"
+version = "1.1.5"
+requires_python = ">=3.5"
 summary = "sphinxcontrib-serializinghtml is a sphinx extension which outputs \"serialized\" HTML files (json and pickle)."
 
 [[package]]
 name = "toml"
-sections = ["dev"]
 version = "0.10.2"
+requires_python = ">=2.6,!=3.0.*,!=3.1.*,!=3.2.*"
 summary = "Python Library for Tom's Obvious, Minimal Language"
 
 [[package]]
 name = "typing-extensions"
-sections = ["dev"]
 version = "3.10.0.0"
-marker = "python_version < '3.8'"
 summary = "Backported and Experimental Type Hints for Python 3.5+"
 
 [[package]]
 name = "urllib3"
-sections = ["dev"]
-version = "1.26.4"
+version = "1.26.5"
+requires_python = ">=2.7,<4.0,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
 summary = "HTTP library with thread-safe connection pooling, file post, and more."
 
 [[package]]
 name = "zipp"
-sections = ["dev"]
 version = "3.4.1"
-marker = "python_version < '3.8'"
+requires_python = ">=3.6"
 summary = "Backport of pathlib-compatible object wrapper for zip files"
 
 [metadata]
-lock_version = "2"
+lock_version = "3"
 content_hash = "sha256:6d9bde62ab30bf5c4d2ff76bafc37388aed09b82efd98d94525545b749c6e0b0"
 
 [metadata.files]
@@ -316,9 +304,9 @@ content_hash = "sha256:6d9bde62ab30bf5c4d2ff76bafc37388aed09b82efd98d94525545b74
     {file = "Babel-2.9.1-py2.py3-none-any.whl", hash = "sha256:ab49e12b91d937cd11f0b67cb259a57ab4ad2b59ac7a3b41d6c06c0ac5b0def9"},
     {file = "Babel-2.9.1.tar.gz", hash = "sha256:bc0c176f9f6a994582230df350aa6e05ba2ebe4b3ac317eab29d9be5d2768da0"},
 ]
-"certifi 2020.12.5" = [
-    {file = "certifi-2020.12.5-py2.py3-none-any.whl", hash = "sha256:719a74fb9e33b9bd44cc7f3a8d94bc35e4049deebe19ba7d8e108280cfd59830"},
-    {file = "certifi-2020.12.5.tar.gz", hash = "sha256:1a4995114262bffbc2413b159f2a1a480c969de6e6eb13ee966d470af86af59c"},
+"certifi 2021.5.30" = [
+    {file = "certifi-2021.5.30-py2.py3-none-any.whl", hash = "sha256:50b1e4f8446b06f41be7dd6338db18e0990601dce795c2b1686458aa7e8fa7d8"},
+    {file = "certifi-2021.5.30.tar.gz", hash = "sha256:2bbf76fd432960138b3ef6dda3dde0544f27cbf8546c458e60baf371917ba9ee"},
 ]
 "chardet 4.0.0" = [
     {file = "chardet-4.0.0-py2.py3-none-any.whl", hash = "sha256:f864054d66fd9118f2e67044ac8981a54775ec5b67aed0441892edb553d21da5"},
@@ -344,71 +332,53 @@ content_hash = "sha256:6d9bde62ab30bf5c4d2ff76bafc37388aed09b82efd98d94525545b74
     {file = "imagesize-1.2.0-py2.py3-none-any.whl", hash = "sha256:6965f19a6a2039c7d48bca7dba2473069ff854c36ae6f19d2cde309d998228a1"},
     {file = "imagesize-1.2.0.tar.gz", hash = "sha256:b1f6b5a4eab1f73479a50fb79fcf729514a900c341d8503d62a62dbc4127a2b1"},
 ]
-"importlib-metadata 4.0.1" = [
-    {file = "importlib_metadata-4.0.1-py3-none-any.whl", hash = "sha256:d7eb1dea6d6a6086f8be21784cc9e3bcfa55872b52309bc5fad53a8ea444465d"},
-    {file = "importlib_metadata-4.0.1.tar.gz", hash = "sha256:8c501196e49fb9df5df43833bdb1e4328f64847763ec8a50703148b73784d581"},
+"importlib-metadata 4.5.0" = [
+    {file = "importlib_metadata-4.5.0-py3-none-any.whl", hash = "sha256:833b26fb89d5de469b24a390e9df088d4e52e4ba33b01dc5e0e4f41b81a16c00"},
+    {file = "importlib_metadata-4.5.0.tar.gz", hash = "sha256:b142cc1dd1342f31ff04bb7d022492b09920cb64fed867cd3ea6f80fe3ebd139"},
 ]
 "iniconfig 1.1.1" = [
     {file = "iniconfig-1.1.1-py2.py3-none-any.whl", hash = "sha256:011e24c64b7f47f6ebd835bb12a743f2fbe9a26d4cecaa7f53bc4f35ee9da8b3"},
     {file = "iniconfig-1.1.1.tar.gz", hash = "sha256:bc3af051d7d14b2ee5ef9969666def0cd1a000e121eaea580d4a313df4b37f32"},
 ]
-"jinja2 2.11.3" = [
-    {file = "Jinja2-2.11.3-py2.py3-none-any.whl", hash = "sha256:03e47ad063331dd6a3f04a43eddca8a966a26ba0c5b7207a9a9e4e08f1b29419"},
-    {file = "Jinja2-2.11.3.tar.gz", hash = "sha256:a6d58433de0ae800347cab1fa3043cebbabe8baa9d29e668f1c768cb87a333c6"},
-]
-"markupsafe 1.1.1" = [
-    {file = "MarkupSafe-1.1.1-cp27-cp27m-macosx_10_6_intel.whl", hash = "sha256:09027a7803a62ca78792ad89403b1b7a73a01c8cb65909cd876f7fcebd79b161"},
-    {file = "MarkupSafe-1.1.1-cp27-cp27m-manylinux1_i686.whl", hash = "sha256:e249096428b3ae81b08327a63a485ad0878de3fb939049038579ac0ef61e17e7"},
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@@ -474,9 +444,9 @@ content_hash = "sha256:6d9bde62ab30bf5c4d2ff76bafc37388aed09b82efd98d94525545b74
     {file = "sphinxcontrib_devhelp-1.0.2-py2.py3-none-any.whl", hash = "sha256:8165223f9a335cc1af7ffe1ed31d2871f325254c0423bc0c4c7cd1c1e4734a2e"},
     {file = "sphinxcontrib-devhelp-1.0.2.tar.gz", hash = "sha256:ff7f1afa7b9642e7060379360a67e9c41e8f3121f2ce9164266f61b9f4b338e4"},
 ]
-"sphinxcontrib-htmlhelp 1.0.3" = [
-    {file = "sphinxcontrib_htmlhelp-1.0.3-py2.py3-none-any.whl", hash = "sha256:3c0bc24a2c41e340ac37c85ced6dafc879ab485c095b1d65d2461ac2f7cca86f"},
-    {file = "sphinxcontrib-htmlhelp-1.0.3.tar.gz", hash = "sha256:e8f5bb7e31b2dbb25b9cc435c8ab7a79787ebf7f906155729338f3156d93659b"},
+"sphinxcontrib-htmlhelp 2.0.0" = [
+    {file = "sphinxcontrib_htmlhelp-2.0.0-py2.py3-none-any.whl", hash = "sha256:d412243dfb797ae3ec2b59eca0e52dac12e75a241bf0e4eb861e450d06c6ed07"},
+    {file = "sphinxcontrib-htmlhelp-2.0.0.tar.gz", hash = "sha256:f5f8bb2d0d629f398bf47d0d69c07bc13b65f75a81ad9e2f71a63d4b7a2f6db2"},
 ]
 "sphinxcontrib-jsmath 1.0.1" = [
     {file = "sphinxcontrib_jsmath-1.0.1-py2.py3-none-any.whl", hash = "sha256:2ec2eaebfb78f3f2078e73666b1415417a116cc848b72e5172e596c871103178"},
@@ -486,9 +456,9 @@ content_hash = "sha256:6d9bde62ab30bf5c4d2ff76bafc37388aed09b82efd98d94525545b74
     {file = "sphinxcontrib_qthelp-1.0.3-py2.py3-none-any.whl", hash = "sha256:bd9fc24bcb748a8d51fd4ecaade681350aa63009a347a8c14e637895444dfab6"},
     {file = "sphinxcontrib-qthelp-1.0.3.tar.gz", hash = "sha256:4c33767ee058b70dba89a6fc5c1892c0d57a54be67ddd3e7875a18d14cba5a72"},
 ]
-"sphinxcontrib-serializinghtml 1.1.4" = [
-    {file = "sphinxcontrib_serializinghtml-1.1.4-py2.py3-none-any.whl", hash = "sha256:f242a81d423f59617a8e5cf16f5d4d74e28ee9a66f9e5b637a18082991db5a9a"},
-    {file = "sphinxcontrib-serializinghtml-1.1.4.tar.gz", hash = "sha256:eaa0eccc86e982a9b939b2b82d12cc5d013385ba5eadcc7e4fed23f4405f77bc"},
+"sphinxcontrib-serializinghtml 1.1.5" = [
+    {file = "sphinxcontrib_serializinghtml-1.1.5-py2.py3-none-any.whl", hash = "sha256:352a9a00ae864471d3a7ead8d7d79f5fc0b57e8b3f95e9867eb9eb28999b92fd"},
+    {file = "sphinxcontrib-serializinghtml-1.1.5.tar.gz", hash = "sha256:aa5f6de5dfdf809ef505c4895e51ef5c9eac17d0f287933eb49ec495280b6952"},
 ]
 "toml 0.10.2" = [
     {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
@@ -499,9 +469,9 @@ content_hash = "sha256:6d9bde62ab30bf5c4d2ff76bafc37388aed09b82efd98d94525545b74
     {file = "typing_extensions-3.10.0.0-py3-none-any.whl", hash = "sha256:779383f6086d90c99ae41cf0ff39aac8a7937a9283ce0a414e5dd782f4c94a84"},
     {file = "typing_extensions-3.10.0.0.tar.gz", hash = "sha256:50b6f157849174217d0656f99dc82fe932884fb250826c18350e159ec6cdf342"},
 ]
-"urllib3 1.26.4" = [
-    {file = "urllib3-1.26.4-py2.py3-none-any.whl", hash = "sha256:2f4da4594db7e1e110a944bb1b551fdf4e6c136ad42e4234131391e21eb5b0df"},
-    {file = "urllib3-1.26.4.tar.gz", hash = "sha256:e7b021f7241115872f92f43c6508082facffbd1c048e3c6e2bb9c2a157e28937"},
+"urllib3 1.26.5" = [
+    {file = "urllib3-1.26.5-py2.py3-none-any.whl", hash = "sha256:753a0374df26658f99d826cfe40394a686d05985786d946fbe4165b5148f5a7c"},
+    {file = "urllib3-1.26.5.tar.gz", hash = "sha256:a7acd0977125325f516bda9735fa7142b909a8d01e8b2e4c8108d0984e6e0098"},
 ]
 "zipp 3.4.1" = [
     {file = "zipp-3.4.1-py3-none-any.whl", hash = "sha256:51cb66cc54621609dd593d1787f286ee42a5c0adbb4b29abea5a63edc3e03098"},
diff --git a/pyproject.toml b/pyproject.toml
index 40a49c8..db4fbb2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,16 +2,6 @@
 requires = ["pdm-pep517"]
 build-backend = "pdm.pep517.api"
 
-[tool.pdm.dev-dependencies]
-dev = [
-    "pytest",
-    "flake8",
-    "sphinx",
-]
-
-[tool.pdm.cli]
-cfonts = "cfonts.cli:main"
-
 [project]
 # PEP 621 project metadata
 # See https://www.python.org/dev/peps/pep-0621/
@@ -39,7 +29,31 @@ classifiers = [
 homepage = "https://github.com/frostming/python-cfonts"
 Documentation = "https://python-cfonts.readthedocs.io/"
 
-[project.optional-dependencies]
-
 [project.scripts]
 cfonts = "cfonts.cli:main"
+
+[tool.pdm.dev-dependencies]
+dev = [
+    "pytest",
+    "flake8",
+    "sphinx",
+]
+
+[tool.isort]
+profile = "black"
+atomic = true
+skip_glob = ["*/setup.py", "pdm/_vendor/*"]
+filter_files = true
+known_first_party = ["pdm"]
+known_third_party = [
+    "appdirs",
+    "atoml",
+    "click",
+    "cfonts",
+    "distlib",
+    "halo",
+    "packaging",
+    "pip_shims",
+    "pytest",
+    "pythonfinder"
+]
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..37fc453
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,15 @@
+[flake8]
+exclude =
+    .git,
+    env,
+    dist,
+    build,
+    __pypackages__,
+max_line_length = 88
+ignore =
+    E203
+    W503
+
+[mypy]
+follow_imports = silent
+ignore_missing_imports = True
diff --git a/tests/conftest.py b/tests/conftest.py
index a3bc3d9..482721d 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,5 +1,6 @@
 """pytest configuration"""
 import re
+
 import pytest
 from cfonts.core import Font
 
@@ -24,6 +25,7 @@ def font_factory(chars={}, colors=1, letterspace=[], buffer=[]):
 @pytest.fixture
 def strip_color():
     def func(text):
-        REGEX = re.compile(r'\x1b\[\d+?m')
-        return REGEX.sub('', text)
+        REGEX = re.compile(r"\x1b\[\d+?m")
+        return REGEX.sub("", text)
+
     return func
diff --git a/tests/example.py b/tests/example.py
index d12f44b..715abeb 100644
--- a/tests/example.py
+++ b/tests/example.py
@@ -9,7 +9,7 @@ def main():
         font="console",
         colors=["gray"],
         background="green",
-        align="center"
+        align="center",
     )
 
 
diff --git a/tests/test_font_class.py b/tests/test_font_class.py
index 46941e2..e7106f3 100644
--- a/tests/test_font_class.py
+++ b/tests/test_font_class.py
@@ -46,4 +46,3 @@ def test_add_letter_spacing_multi_lines(font):
         "_",
         "_",
     ]
-
diff --git a/tests/test_render.py b/tests/test_render.py
index 5a722eb..2ce94b1 100644
--- a/tests/test_render.py
+++ b/tests/test_render.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 # flake8: noqa
 from __future__ import unicode_literals
+
 import pytest
 from cfonts import render
 
diff --git a/tests/test_render_console.py b/tests/test_render_console.py
index 1701560..9b90c1e 100644
--- a/tests/test_render_console.py
+++ b/tests/test_render_console.py
@@ -7,10 +7,9 @@ def test_render_console_default():
 
 
 def test_render_console_long_text():
-    assert (
-        render_console("this is a very long line to test multi lines", size=(10, 10))
-        == ["this is a", "very long", "line to te", "st multi l", "ines"]
-    )
+    assert render_console(
+        "this is a very long line to test multi lines", size=(10, 10)
+    ) == ["this is a", "very long", "line to te", "st multi l", "ines"]
 
 
 def test_render_console_align():
@@ -22,23 +21,22 @@ def test_render_console_align():
 def test_render_console_letter_spacing():
     assert render_console("text", letter_spacing=2, size=(10, 10)) == ["t e x t"]
     assert render_console("text", letter_spacing=3, size=(100, 10)) == ["t  e  x  t"]
-    assert (
-        render_console("text", letter_spacing=10, size=(100, 10))
-        == ["t         e         x         t"]
-    )
-
-    assert (
-        render_console("text|text", letter_spacing=2, size=(10, 10))
-        == ["t e x t", "t e x t"]
-    )
-    assert (
-        render_console("text|text", letter_spacing=3, size=(100, 10))
-        == ["t  e  x  t", "t  e  x  t"]
-    )
-    assert (
-        render_console("text|text", letter_spacing=10, size=(100, 10))
-        == ["t         e         x         t", "t         e         x         t"]
-    )
+    assert render_console("text", letter_spacing=10, size=(100, 10)) == [
+        "t         e         x         t"
+    ]
+
+    assert render_console("text|text", letter_spacing=2, size=(10, 10)) == [
+        "t e x t",
+        "t e x t",
+    ]
+    assert render_console("text|text", letter_spacing=3, size=(100, 10)) == [
+        "t  e  x  t",
+        "t  e  x  t",
+    ]
+    assert render_console("text|text", letter_spacing=10, size=(100, 10)) == [
+        "t         e         x         t",
+        "t         e         x         t",
+    ]
 
 
 def test_render_console_line_height():
@@ -61,39 +59,42 @@ def test_render_console_line_height():
 
 
 def test_render_console_line_break():
-    assert (
-        render_console("this is a long line", line_height=2, size=(10, 10))
-        == ["this is a", "", "long line", ""]
-    )
-    assert (
-        render_console("this is a long line", line_height=3, size=(10, 10))
-        == ["this is a", "", "", "long line", "", ""]
-    )
-    assert (
-        render_console("this is a long line", line_height=10, size=(10, 10))
-        == [
-            "this is a",
-            "",
-            "",
-            "",
-            "",
-            "",
-            "",
-            "",
-            "",
-            "",
-            "long line",
-            "",
-            "",
-            "",
-            "",
-            "",
-            "",
-            "",
-            "",
-            "",
-        ]
-    )
+    assert render_console("this is a long line", line_height=2, size=(10, 10)) == [
+        "this is a",
+        "",
+        "long line",
+        "",
+    ]
+    assert render_console("this is a long line", line_height=3, size=(10, 10)) == [
+        "this is a",
+        "",
+        "",
+        "long line",
+        "",
+        "",
+    ]
+    assert render_console("this is a long line", line_height=10, size=(10, 10)) == [
+        "this is a",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "long line",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+    ]
 
 
 def test_render_console_color(strip_color):
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 3bd61a2..5ad0156 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -1,17 +1,16 @@
 # -*- coding: utf-8 -*-
 """Test utility functions"""
 import pytest
-
-from cfonts.core import add_line, char_length, align_text, clean_input, colorize
 from cfonts.colors import (
-    get_closest,
-    hex_to_rgb,
     AnsiPen,
     TrueColorPen,
+    get_closest,
+    hex_to_rgb,
+    hsv_to_rgb,
     rgb_to_hex,
     rgb_to_hsv,
-    hsv_to_rgb,
 )
+from cfonts.core import add_line, align_text, char_length, clean_input, colorize
 
 
 def test_add_line_single_font():
@@ -128,8 +127,8 @@ def test_ansi_pen(color, is_background, style):
 @pytest.mark.parametrize(
     "color,is_background,style",
     [
-        ("#ff5f52", False, ("\x01\x1b[38;2;255;95;82m", "\x1b[39m")),
-        ("#ff5f52", True, ("\x01\x1b[48;2;255;95;82m", "\x1b[49m")),
+        ("#ff5f52", False, ("\x1b[38;2;255;95;82m", "\x1b[39m")),
+        ("#ff5f52", True, ("\x1b[48;2;255;95;82m", "\x1b[49m")),
     ],
 )
 def test_truecolor_pen(color, is_background, style):