diff --git a/exercises/basic/receive.py b/exercises/basic/receive.py
index 04e9bd973..746d317a5 100755
--- a/exercises/basic/receive.py
+++ b/exercises/basic/receive.py
@@ -1,14 +1,20 @@
 #!/usr/bin/env python3
-import sys
-import struct
 import os
+import sys
 
-from scapy.all import sniff, sendp, hexdump, get_if_list, get_if_hwaddr
-from scapy.all import Packet, IPOption
-from scapy.all import ShortField, IntField, LongField, BitField, FieldListField, FieldLenField
-from scapy.all import IP, TCP, UDP, Raw
+from scapy.all import (
+    TCP,
+    FieldLenField,
+    FieldListField,
+    IntField,
+    IPOption,
+    ShortField,
+    get_if_list,
+    sniff
+)
 from scapy.layers.inet import _IPOption_HDR
 
+
 def get_if():
     ifs=get_if_list()
     iface=None
@@ -44,7 +50,7 @@ def handle_pkt(pkt):
 def main():
     ifaces = [i for i in os.listdir('/sys/class/net/') if 'eth' in i]
     iface = ifaces[0]
-    print(("sniffing on %s" % iface))
+    print("sniffing on %s" % iface)
     sys.stdout.flush()
     sniff(iface = iface,
           prn = lambda x: handle_pkt(x))
diff --git a/exercises/basic/send.py b/exercises/basic/send.py
index b320b0d92..e12213c3f 100755
--- a/exercises/basic/send.py
+++ b/exercises/basic/send.py
@@ -1,13 +1,10 @@
 #!/usr/bin/env python3
-import argparse
-import sys
-import socket
 import random
-import struct
+import socket
+import sys
+
+from scapy.all import IP, TCP, Ether, get_if_hwaddr, get_if_list, sendp
 
-from scapy.all import sendp, send, get_if_list, get_if_hwaddr
-from scapy.all import Packet
-from scapy.all import Ether, IP, UDP, TCP
 
 def get_if():
     ifs=get_if_list()
@@ -30,7 +27,7 @@ def main():
     addr = socket.gethostbyname(sys.argv[1])
     iface = get_if()
 
-    print(("sending on interface %s to %s" % (iface, str(addr))))
+    print("sending on interface %s to %s" % (iface, str(addr)))
     pkt =  Ether(src=get_if_hwaddr(iface), dst='ff:ff:ff:ff:ff:ff')
     pkt = pkt /IP(dst=addr) / TCP(dport=1234, sport=random.randint(49152,65535)) / sys.argv[2]
     pkt.show2()
diff --git a/exercises/basic_tunnel/myTunnel_header.py b/exercises/basic_tunnel/myTunnel_header.py
index 5a5922ec8..714e0029c 100644
--- a/exercises/basic_tunnel/myTunnel_header.py
+++ b/exercises/basic_tunnel/myTunnel_header.py
@@ -1,6 +1,6 @@
 
+
 from scapy.all import *
-import sys, os
 
 TYPE_MYTUNNEL = 0x1212
 TYPE_IPV4 = 0x0800
diff --git a/exercises/basic_tunnel/receive.py b/exercises/basic_tunnel/receive.py
index 3b065c00f..ac5b3ea75 100755
--- a/exercises/basic_tunnel/receive.py
+++ b/exercises/basic_tunnel/receive.py
@@ -1,14 +1,10 @@
 #!/usr/bin/env python3
-import sys
-import struct
 import os
+import sys
 
-from scapy.all import sniff, sendp, hexdump, get_if_list, get_if_hwaddr
-from scapy.all import Packet, IPOption
-from scapy.all import ShortField, IntField, LongField, BitField, FieldListField, FieldLenField
-from scapy.all import IP, TCP, UDP, Raw
-from scapy.layers.inet import _IPOption_HDR
 from myTunnel_header import MyTunnel
+from scapy.all import TCP, get_if_list, sniff
+
 
 def get_if():
     ifs=get_if_list()
@@ -34,7 +30,7 @@ def handle_pkt(pkt):
 def main():
     ifaces = [i for i in os.listdir('/sys/class/net/') if 'eth' in i]
     iface = ifaces[0]
-    print(("sniffing on %s" % iface))
+    print("sniffing on %s" % iface)
     sys.stdout.flush()
     sniff(iface = iface,
           prn = lambda x: handle_pkt(x))
diff --git a/exercises/basic_tunnel/send.py b/exercises/basic_tunnel/send.py
index ac29bd909..5d01f463c 100755
--- a/exercises/basic_tunnel/send.py
+++ b/exercises/basic_tunnel/send.py
@@ -1,15 +1,11 @@
 #!/usr/bin/env python3
 import argparse
-import sys
-import socket
 import random
-import struct
-import argparse
+import socket
 
-from scapy.all import sendp, send, get_if_list, get_if_hwaddr, hexdump
-from scapy.all import Packet
-from scapy.all import Ether, IP, UDP, TCP
 from myTunnel_header import MyTunnel
+from scapy.all import IP, TCP, Ether, get_if_hwaddr, get_if_list, sendp
+
 
 def get_if():
     ifs=get_if_list()
@@ -35,11 +31,11 @@ def main():
     iface = get_if()
 
     if (dst_id is not None):
-        print(("sending on interface {} to dst_id {}".format(iface, str(dst_id))))
+        print("sending on interface {} to dst_id {}".format(iface, str(dst_id)))
         pkt =  Ether(src=get_if_hwaddr(iface), dst='ff:ff:ff:ff:ff:ff')
         pkt = pkt / MyTunnel(dst_id=dst_id) / IP(dst=addr) / args.message
     else:
-        print(("sending on interface {} to IP addr {}".format(iface, str(addr))))
+        print("sending on interface {} to IP addr {}".format(iface, str(addr)))
         pkt =  Ether(src=get_if_hwaddr(iface), dst='ff:ff:ff:ff:ff:ff')
         pkt = pkt / IP(dst=addr) / TCP(dport=1234, sport=random.randint(49152,65535)) / args.message
 
diff --git a/exercises/calc/calc.py b/exercises/calc/calc.py
index 5209c6b7c..5750a3f9c 100644
--- a/exercises/calc/calc.py
+++ b/exercises/calc/calc.py
@@ -1,17 +1,17 @@
 #!/usr/bin/env python3
 
-import argparse
-import sys
-import socket
-import random
-import struct
 import re
 
-from scapy.all import sendp, send, srp1
-from scapy.all import Packet, hexdump
-from scapy.all import Ether, StrFixedLenField, XByteField, IntField
-from scapy.all import bind_layers
-import readline
+from scapy.all import (
+    Ether,
+    IntField,
+    Packet,
+    StrFixedLenField,
+    XByteField,
+    bind_layers,
+    srp1
+)
+
 
 class P4calc(Packet):
     name = "P4calc"
@@ -84,7 +84,7 @@ def main():
             if resp:
                 p4calc=resp[P4calc]
                 if p4calc:
-                    print((p4calc.result))
+                    print(p4calc.result)
                 else:
                     print("cannot find P4calc header in the packet")
             else:
diff --git a/exercises/ecn/receive.py b/exercises/ecn/receive.py
index ca368eed0..fa3836e6b 100755
--- a/exercises/ecn/receive.py
+++ b/exercises/ecn/receive.py
@@ -1,11 +1,8 @@
 #!/usr/bin/env python3
 import sys
-import struct
 
-from scapy.all import sniff, sendp, hexdump, get_if_list, get_if_hwaddr
-from scapy.all import Packet
-from scapy.all import IP, UDP, Raw
-from scapy.layers.inet import _IPOption_HDR
+from scapy.all import get_if_list, sniff
+
 
 def get_if():
     ifs=get_if_list()
@@ -28,7 +25,7 @@ def handle_pkt(pkt):
 
 def main():
     iface = 'eth0'
-    print(("sniffing on %s" % iface))
+    print("sniffing on %s" % iface)
     sys.stdout.flush()
     sniff(filter="udp and port 4321", iface = iface,
           prn = lambda x: handle_pkt(x))
diff --git a/exercises/ecn/send.py b/exercises/ecn/send.py
index 1a6778cfa..0cccb2019 100755
--- a/exercises/ecn/send.py
+++ b/exercises/ecn/send.py
@@ -1,18 +1,11 @@
 #!/usr/bin/env python3
 
-import argparse
-import sys
 import socket
-import random
-import struct
+import sys
+from time import sleep
 
-from scapy.all import sendp, send, hexdump, get_if_list, get_if_hwaddr
-from scapy.all import Packet, IPOption
-from scapy.all import Ether, IP, UDP
-from scapy.all import IntField, FieldListField, FieldLenField, ShortField
-from scapy.layers.inet import _IPOption_HDR
+from scapy.all import IP, UDP, Ether, get_if_hwaddr, get_if_list, sendp
 
-from time import sleep
 
 def get_if():
     ifs=get_if_list()
diff --git a/exercises/link_monitor/receive.py b/exercises/link_monitor/receive.py
index a7250e3f8..4ef7040b8 100755
--- a/exercises/link_monitor/receive.py
+++ b/exercises/link_monitor/receive.py
@@ -2,6 +2,7 @@
 
 from probe_hdrs import *
 
+
 def expand(x):
     yield x
     while x.payload:
@@ -14,11 +15,11 @@ def handle_pkt(pkt):
         print("")
         for sw in data_layers:
             utilization = 0 if sw.cur_time == sw.last_time else 8.0*sw.byte_cnt/(sw.cur_time - sw.last_time)
-            print(("Switch {} - Port {}: {} Mbps".format(sw.swid, sw.port, utilization)))
+            print("Switch {} - Port {}: {} Mbps".format(sw.swid, sw.port, utilization))
 
 def main():
     iface = 'eth0'
-    print(("sniffing on {}".format(iface)))
+    print("sniffing on {}".format(iface))
     sniff(iface = iface,
           prn = lambda x: handle_pkt(x))
 
diff --git a/exercises/link_monitor/send.py b/exercises/link_monitor/send.py
index 0ba04160b..c4e1a7080 100755
--- a/exercises/link_monitor/send.py
+++ b/exercises/link_monitor/send.py
@@ -1,8 +1,10 @@
 #!/usr/bin/env python3
 import sys
 import time
+
 from probe_hdrs import *
 
+
 def main():
 
     probe_pkt = Ether(dst='ff:ff:ff:ff:ff:ff', src=get_if_hwaddr('eth0')) / \
diff --git a/exercises/load_balance/receive.py b/exercises/load_balance/receive.py
index 1156e7c45..671088120 100755
--- a/exercises/load_balance/receive.py
+++ b/exercises/load_balance/receive.py
@@ -1,14 +1,19 @@
 #!/usr/bin/env python3
-import sys
-import struct
 import os
+import sys
 
-from scapy.all import sniff, sendp, hexdump, get_if_list, get_if_hwaddr
-from scapy.all import Packet, IPOption
-from scapy.all import ShortField, IntField, LongField, BitField, FieldListField, FieldLenField
-from scapy.all import IP, UDP, Raw
+from scapy.all import (
+    FieldLenField,
+    FieldListField,
+    IntField,
+    IPOption,
+    ShortField,
+    get_if_list,
+    sniff
+)
 from scapy.layers.inet import _IPOption_HDR
 
+
 def get_if():
     ifs=get_if_list()
     iface=None
diff --git a/exercises/load_balance/send.py b/exercises/load_balance/send.py
index 939a12871..e12213c3f 100755
--- a/exercises/load_balance/send.py
+++ b/exercises/load_balance/send.py
@@ -1,13 +1,10 @@
 #!/usr/bin/env python3
-import argparse
-import sys
-import socket
 import random
-import struct
+import socket
+import sys
+
+from scapy.all import IP, TCP, Ether, get_if_hwaddr, get_if_list, sendp
 
-from scapy.all import sendp, send, get_if_list, get_if_hwaddr
-from scapy.all import Packet
-from scapy.all import Ether, IP, UDP, TCP
 
 def get_if():
     ifs=get_if_list()
diff --git a/exercises/mri/receive.py b/exercises/mri/receive.py
index 2f8a5fbba..5c834f694 100755
--- a/exercises/mri/receive.py
+++ b/exercises/mri/receive.py
@@ -1,13 +1,19 @@
 #!/usr/bin/env python3
 import sys
-import struct
 
-from scapy.all import sniff, sendp, hexdump, get_if_list, get_if_hwaddr
-from scapy.all import Packet, IPOption
-from scapy.all import PacketListField, ShortField, IntField, LongField, BitField, FieldListField, FieldLenField
-from scapy.all import IP, UDP, Raw
+from scapy.all import (
+    FieldLenField,
+    IntField,
+    IPOption,
+    Packet,
+    PacketListField,
+    ShortField,
+    get_if_list,
+    sniff
+)
 from scapy.layers.inet import _IPOption_HDR
 
+
 def get_if():
     ifs=get_if_list()
     iface=None
diff --git a/exercises/mri/send.py b/exercises/mri/send.py
index 5d0104647..8e0001eeb 100755
--- a/exercises/mri/send.py
+++ b/exercises/mri/send.py
@@ -1,18 +1,25 @@
 #!/usr/bin/env python3
 
-import argparse
-import sys
 import socket
-import random
-import struct
+import sys
+from time import sleep
 
-from scapy.all import sendp, send, hexdump, get_if_list, get_if_hwaddr
-from scapy.all import Packet, IPOption
-from scapy.all import Ether, IP, UDP
-from scapy.all import IntField, FieldListField, FieldLenField, ShortField, PacketListField
+from scapy.all import (
+    IP,
+    UDP,
+    Ether,
+    FieldLenField,
+    IntField,
+    IPOption,
+    Packet,
+    PacketListField,
+    ShortField,
+    get_if_hwaddr,
+    get_if_list,
+    sendp
+)
 from scapy.layers.inet import _IPOption_HDR
 
-from time import sleep
 
 def get_if():
     ifs=get_if_list()
diff --git a/exercises/p4runtime/mycontroller.py b/exercises/p4runtime/mycontroller.py
index 7f127e6c5..4be31586c 100755
--- a/exercises/p4runtime/mycontroller.py
+++ b/exercises/p4runtime/mycontroller.py
@@ -1,19 +1,20 @@
 #!/usr/bin/env python3
 import argparse
-import grpc
 import os
 import sys
 from time import sleep
 
+import grpc
+
 # Import P4Runtime lib from parent utils dir
 # Probably there's a better way of doing this.
 sys.path.append(
     os.path.join(os.path.dirname(os.path.abspath(__file__)),
                  '../../utils/'))
 import p4runtime_lib.bmv2
+import p4runtime_lib.helper
 from p4runtime_lib.error_utils import printGrpcError
 from p4runtime_lib.switch import ShutdownAllSwitchConnections
-import p4runtime_lib.helper
 
 SWITCH_TO_HOST_PORT = 1
 SWITCH_TO_SWITCH_PORT = 2
diff --git a/exercises/p4runtime/solution/mycontroller.py b/exercises/p4runtime/solution/mycontroller.py
index 6a9a20baa..926a6c329 100755
--- a/exercises/p4runtime/solution/mycontroller.py
+++ b/exercises/p4runtime/solution/mycontroller.py
@@ -1,18 +1,19 @@
 #!/usr/bin/env python3
 import argparse
-import grpc
 import os
 import sys
 from time import sleep
 
+import grpc
+
 # Import P4Runtime lib from parent utils dir
 # Probably there's a better way of doing this.
 sys.path.append(
     os.path.join(os.path.dirname(os.path.abspath(__file__)),
                  '../../utils/'))
 import p4runtime_lib.bmv2
-from p4runtime_lib.switch import ShutdownAllSwitchConnections
 import p4runtime_lib.helper
+from p4runtime_lib.switch import ShutdownAllSwitchConnections
 
 SWITCH_TO_HOST_PORT = 1
 SWITCH_TO_SWITCH_PORT = 2
diff --git a/exercises/qos/receive.py b/exercises/qos/receive.py
index ee1e4ad33..73555bd01 100755
--- a/exercises/qos/receive.py
+++ b/exercises/qos/receive.py
@@ -1,7 +1,8 @@
 #!/usr/bin/env python3
 
 import sys
-from scapy.all import sniff, get_if_list
+
+from scapy.all import sniff
 
 
 def handle_pkt(pkt):
diff --git a/exercises/qos/send.py b/exercises/qos/send.py
index c0c6afc1e..4b6bd42d9 100755
--- a/exercises/qos/send.py
+++ b/exercises/qos/send.py
@@ -2,12 +2,10 @@
 
 import argparse
 import socket
-
-from scapy.all import sendp, send, hexdump, get_if_list, get_if_hwaddr
-from scapy.all import Ether, IP, UDP, TCP
-
 from time import sleep
 
+from scapy.all import IP, TCP, UDP, Ether, get_if_hwaddr, get_if_list, sendp
+
 
 def get_if():
     iface = None
diff --git a/exercises/source_routing/receive.py b/exercises/source_routing/receive.py
index 435311e07..12f58e71d 100755
--- a/exercises/source_routing/receive.py
+++ b/exercises/source_routing/receive.py
@@ -1,12 +1,10 @@
 #!/usr/bin/env python3
 import sys
-import struct
 
-from scapy.all import sniff, sendp, hexdump, get_if_list, get_if_hwaddr, bind_layers
-from scapy.all import Packet, IPOption
-from scapy.all import IP, UDP, Raw, Ether
-from scapy.layers.inet import _IPOption_HDR
+from scapy.all import Ether, IPOption, Packet, bind_layers, get_if_list, sniff
 from scapy.fields import *
+from scapy.layers.inet import _IPOption_HDR
+
 
 def get_if():
     ifs=get_if_list()
diff --git a/exercises/source_routing/send.py b/exercises/source_routing/send.py
index f972aed93..26230228a 100755
--- a/exercises/source_routing/send.py
+++ b/exercises/source_routing/send.py
@@ -1,15 +1,19 @@
 #!/usr/bin/env python3
-import argparse
-import sys
 import socket
-import random
-import struct
+import sys
 
-from scapy.all import sendp, send, get_if_list, get_if_hwaddr, bind_layers
-from scapy.all import Packet
-from scapy.all import Ether, IP, UDP
+from scapy.all import (
+    IP,
+    UDP,
+    Ether,
+    Packet,
+    bind_layers,
+    get_if_hwaddr,
+    get_if_list,
+    sendp
+)
 from scapy.fields import *
-import readline
+
 
 def get_if():
     ifs=get_if_list()
diff --git a/utils/mininet/appcontroller.py b/utils/mininet/appcontroller.py
index 3c7ead16f..f783bd944 100644
--- a/utils/mininet/appcontroller.py
+++ b/utils/mininet/appcontroller.py
@@ -2,6 +2,7 @@
 
 from shortest_path import ShortestPath
 
+
 class AppController:
 
     def __init__(self, manifest=None, target=None, topo=None, net=None, links=None):
diff --git a/utils/mininet/apptopo.py b/utils/mininet/apptopo.py
index f2b615290..ac543afa9 100644
--- a/utils/mininet/apptopo.py
+++ b/utils/mininet/apptopo.py
@@ -1,5 +1,6 @@
 from mininet.topo import Topo
 
+
 class AppTopo(Topo):
 
     def __init__(self, links, latencies={}, manifest=None, target=None,
diff --git a/utils/mininet/multi_switch_mininet.py b/utils/mininet/multi_switch_mininet.py
index 0d58358bc..288ad6c02 100755
--- a/utils/mininet/multi_switch_mininet.py
+++ b/utils/mininet/multi_switch_mininet.py
@@ -15,25 +15,21 @@
 # limitations under the License.
 #
 
-import signal
-import os
-import sys
-import subprocess
 import argparse
-import json
 import importlib
+import json
+import os
 import re
+import sys
 from time import sleep
 
-from mininet.net import Mininet
-from mininet.topo import Topo
-from mininet.link import TCLink
-from mininet.log import setLogLevel, info
-from mininet.cli import CLI
-
-from p4_mininet import P4Switch, P4Host
-import apptopo
 import appcontroller
+import apptopo
+from mininet.cli import CLI
+from mininet.link import TCLink
+from mininet.log import setLogLevel
+from mininet.net import Mininet
+from p4_mininet import P4Host, P4Switch
 
 parser = argparse.ArgumentParser(description='Mininet demo')
 parser.add_argument('--behavioral-exe', help='Path to behavioral executable',
diff --git a/utils/mininet/p4_mininet.py b/utils/mininet/p4_mininet.py
index 81757541a..fcfacc13a 100644
--- a/utils/mininet/p4_mininet.py
+++ b/utils/mininet/p4_mininet.py
@@ -13,15 +13,16 @@
 # limitations under the License.
 #
 
-from mininet.net import Mininet
-from mininet.node import Switch, Host
-from mininet.log import setLogLevel, info, error, debug
-from mininet.moduledeps import pathCheck
-from sys import exit
-from time import sleep
 import os
-import tempfile
 import socket
+import tempfile
+from sys import exit
+from time import sleep
+
+from mininet.log import debug, error, info
+from mininet.moduledeps import pathCheck
+from mininet.node import Host, Switch
+
 
 class P4Host(Host):
     def config(self, **params):
diff --git a/utils/mininet/single_switch_mininet.py b/utils/mininet/single_switch_mininet.py
index 9c2431d8e..5a807aa34 100755
--- a/utils/mininet/single_switch_mininet.py
+++ b/utils/mininet/single_switch_mininet.py
@@ -15,17 +15,16 @@
 # limitations under the License.
 #
 
-from mininet.net import Mininet
-from mininet.topo import Topo
-from mininet.log import setLogLevel, info
-from mininet.cli import CLI
-
-from p4_mininet import P4Switch, P4Host
-
 import argparse
 from subprocess import PIPE, Popen
 from time import sleep
 
+from mininet.cli import CLI
+from mininet.log import setLogLevel
+from mininet.net import Mininet
+from mininet.topo import Topo
+from p4_mininet import P4Host, P4Switch
+
 parser = argparse.ArgumentParser(description='Mininet demo')
 parser.add_argument('--behavioral-exe', help='Path to behavioral executable',
                     type=str, action="store", required=True)
diff --git a/utils/netstat.py b/utils/netstat.py
index bb12ffdf5..fa7f1ea25 100644
--- a/utils/netstat.py
+++ b/utils/netstat.py
@@ -14,6 +14,8 @@
 #
 
 import psutil
+
+
 def check_listening_on_port(port):
     for c in psutil.net_connections(kind='inet'):
         if c.status == 'LISTEN' and c.laddr[1] == port:
diff --git a/utils/p4_mininet.py b/utils/p4_mininet.py
index fad514178..2554f2da1 100644
--- a/utils/p4_mininet.py
+++ b/utils/p4_mininet.py
@@ -13,16 +13,14 @@
 # limitations under the License.
 #
 
-from mininet.net import Mininet
-from mininet.node import Switch, Host
-from mininet.log import setLogLevel, info, error, debug
-from mininet.moduledeps import pathCheck
-from sys import exit
 import os
 import tempfile
-import socket
+from sys import exit
 from time import sleep
 
+from mininet.log import debug, error, info
+from mininet.moduledeps import pathCheck
+from mininet.node import Host, Switch
 from netstat import check_listening_on_port
 
 SWITCH_START_TIMEOUT = 10 # seconds
diff --git a/utils/p4apprunner.py b/utils/p4apprunner.py
index e3a9e0035..c06d03470 100755
--- a/utils/p4apprunner.py
+++ b/utils/p4apprunner.py
@@ -16,11 +16,11 @@
 
 
 import argparse
-from collections import OrderedDict
 import json
 import os
 import sys
 import tarfile
+from collections import OrderedDict
 
 parser = argparse.ArgumentParser(description='p4apprunner')
 parser.add_argument('--build-dir', help='Directory to build in.',
diff --git a/utils/p4runtime_lib/bmv2.py b/utils/p4runtime_lib/bmv2.py
index eebb44ad4..92780de1a 100644
--- a/utils/p4runtime_lib/bmv2.py
+++ b/utils/p4runtime_lib/bmv2.py
@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-from .switch import SwitchConnection
 from p4.tmp import p4config_pb2
 
+from .switch import SwitchConnection
+
 
 def buildDeviceConfig(bmv2_json_file_path=None):
     "Builds the device config for BMv2"
diff --git a/utils/p4runtime_lib/convert.py b/utils/p4runtime_lib/convert.py
index 50d6a5d84..671b9107c 100644
--- a/utils/p4runtime_lib/convert.py
+++ b/utils/p4runtime_lib/convert.py
@@ -12,11 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+import math
 import re
 import socket
 
-import math
-
 '''
 This package contains several helper functions for encoding to and decoding from byte strings:
 - integers
diff --git a/utils/p4runtime_lib/error_utils.py b/utils/p4runtime_lib/error_utils.py
index 532ca32a1..c3818d076 100644
--- a/utils/p4runtime_lib/error_utils.py
+++ b/utils/p4runtime_lib/error_utils.py
@@ -15,10 +15,10 @@
 
 import sys
 
-from google.rpc import status_pb2, code_pb2
 import grpc
+from google.rpc import code_pb2, status_pb2
 from p4.v1 import p4runtime_pb2
-from p4.v1 import p4runtime_pb2_grpc
+
 
 # Used to indicate that the gRPC error Status object returned by the server has
 # an incorrect format.
diff --git a/utils/p4runtime_lib/helper.py b/utils/p4runtime_lib/helper.py
index e05688a98..c57e0de29 100644
--- a/utils/p4runtime_lib/helper.py
+++ b/utils/p4runtime_lib/helper.py
@@ -15,11 +15,12 @@
 import re
 
 import google.protobuf.text_format
-from p4.v1 import p4runtime_pb2
 from p4.config.v1 import p4info_pb2
+from p4.v1 import p4runtime_pb2
 
 from .convert import encode
 
+
 class P4InfoHelper(object):
     def __init__(self, p4_info_filepath):
         p4info = p4info_pb2.P4Info()
diff --git a/utils/p4runtime_lib/simple_controller.py b/utils/p4runtime_lib/simple_controller.py
index ffce5c1ef..61cd61010 100755
--- a/utils/p4runtime_lib/simple_controller.py
+++ b/utils/p4runtime_lib/simple_controller.py
@@ -19,11 +19,10 @@
 import os
 import sys
 
-from . import bmv2
-from . import helper
-
 from p4.config.v1 import p4info_pb2
 
+from . import bmv2, helper
+
 
 def error(msg):
     print(' - ERROR! ' + msg, file=sys.stderr)
diff --git a/utils/p4runtime_lib/switch.py b/utils/p4runtime_lib/switch.py
index 0c171a5f9..d02fee885 100644
--- a/utils/p4runtime_lib/switch.py
+++ b/utils/p4runtime_lib/switch.py
@@ -12,14 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-from queue import Queue
 from abc import abstractmethod
 from datetime import datetime
+from queue import Queue
 
 import grpc
-from p4.v1 import p4runtime_pb2
-from p4.v1 import p4runtime_pb2_grpc
 from p4.tmp import p4config_pb2
+from p4.v1 import p4runtime_pb2, p4runtime_pb2_grpc
 
 MSG_LOG_MAX_LEN = 1024
 
diff --git a/utils/p4runtime_switch.py b/utils/p4runtime_switch.py
index 31d735f6c..7c46c8866 100644
--- a/utils/p4runtime_switch.py
+++ b/utils/p4runtime_switch.py
@@ -14,15 +14,16 @@
 # limitations under the License.
 #
 
-import sys, os, tempfile, socket
+import os
+import tempfile
 from time import sleep
 
-from mininet.node import Switch
+from mininet.log import debug, error, info
 from mininet.moduledeps import pathCheck
-from mininet.log import info, error, debug
-
-from p4_mininet import P4Switch, SWITCH_START_TIMEOUT
+from mininet.node import Switch
 from netstat import check_listening_on_port
+from p4_mininet import SWITCH_START_TIMEOUT, P4Switch
+
 
 class P4RuntimeSwitch(P4Switch):
     "BMv2 switch with gRPC support"
diff --git a/utils/run_exercise.py b/utils/run_exercise.py
index 42886d6f2..44c8ff62c 100755
--- a/utils/run_exercise.py
+++ b/utils/run_exercise.py
@@ -19,18 +19,20 @@
 # We encourage you to dissect this script to better understand the BMv2/Mininet
 # environment used by the P4 tutorial.
 #
-import os, sys, json, subprocess, re, argparse
+import argparse
+import json
+import os
+import subprocess
 from time import sleep
 
-from p4_mininet import P4Switch, P4Host
-
+import p4runtime_lib.simple_controller
+from mininet.cli import CLI
+from mininet.link import TCLink
 from mininet.net import Mininet
 from mininet.topo import Topo
-from mininet.link import TCLink
-from mininet.cli import CLI
-
+from p4_mininet import P4Host, P4Switch
 from p4runtime_switch import P4RuntimeSwitch
-import p4runtime_lib.simple_controller
+
 
 def configureP4Switch(**switch_args):
     """ Helper class that is called by mininet to initialize