Skip to content

Latest commit

 

History

History
256 lines (150 loc) · 9.79 KB

CONTRIBUTING.rst

File metadata and controls

256 lines (150 loc) · 9.79 KB

How To Contribute

Every open source project lives from the generous help by contributors that sacrifice their time and python-telegram-bot is no different. To make participation as pleasant as possible, this project adheres to the Code of Conduct by the Python Software Foundation.

Setting things up

  1. Fork the python-telegram-bot repository to your GitHub account.

  2. Clone your forked repository of python-telegram-bot to your computer:

    $ git clone https://github.com/<your username>/python-telegram-bot --recursive
$ cd python-telegram-bot

  3. Add a track to the original repository:

    $ git remote add upstream https://github.com/python-telegram-bot/python-telegram-bot

  4. Install dependencies:

    $ pip install -r requirements.txt -r requirements-dev.txt

  5. Install pre-commit hooks:

    $ pre-commit install

Finding something to do

If you already know what you'd like to work on, you can skip this section.

If you have an idea for something to do, first check if it's already been filed on the issue tracker. If so, add a comment to the issue saying you'd like to work on it, and we'll help you get started! Otherwise, please file a new issue and assign yourself to it.

Another great way to start contributing is by writing tests. Tests are really important because they help prevent developers from accidentally breaking existing code, allowing them to build cool things faster. If you're interested in helping out, let the development team know by posting to the Telegram group (use @admins to mention the maintainers), and we'll help you get started.

That being said, we want to mention that we are very hesitant about adding new requirements to our projects. If you intend to do this, please state this in an issue and get a verification from one of the maintainers.

Instructions for making a code change

The central development branch is master, which should be clean and ready for release at any time. In general, all changes should be done as feature branches based off of master.

Here's how to make a one-off code change.

  1. Choose a descriptive branch name. It should be lowercase, hyphen-separated, and a noun describing the change (so, fuzzy-rules, but not implement-fuzzy-rules). Also, it shouldn't start with hotfix or release.

  2. Create a new branch with this name, starting from master. In other words, run:

    $ git fetch upstream
$ git checkout master
$ git merge upstream/master
$ git checkout -b your-branch-name

  3. Make a commit to your feature branch. Each commit should be self-contained and have a descriptive commit message that helps other developers understand why the changes were made.

    • You can refer to relevant issues in the commit message by writing, e.g., "#105".

    • Your code should adhere to the PEP 8 Style Guide, with the exception that we have a maximum line length of 99.

    • Provide static typing with signature annotations. The documentation of MyPy will be a good start, the cheat sheet is here. We also have some custom type aliases in telegram.utils.helpers.typing.

    • Document your code. This project uses sphinx to generate static HTML docs. To build them, first make sure you have the required dependencies:

      $ pip install -r docs/requirements-docs.txt

      then run the following from the PTB root directory:

      $ make -C docs html

      or, if you don't have make available (e.g. on Windows):

      $ sphinx-build docs/source docs/build/html

      Once the process terminates, you can view the built documentation by opening docs/build/html/index.html with a browser.

    • For consistency, please conform to Google Python Style Guide and Google Python Style Docstrings.

    • The following exceptions to the above (Google's) style guides applies:

      • Documenting types of global variables and complex types of class members can be done using the Sphinx docstring convention.

    • In addition, PTB uses the Black coder formatting. Plugins for Black exist for some popular editors. You can use those instead of manually formatting everything.

    • Please ensure that the code you write is well-tested.

    • Don’t break backward compatibility.

    • Add yourself to the AUTHORS.rst file in an alphabetical fashion.

    • Before making a commit ensure that all automated tests still pass:

      $ make test

      If you don't have make, do:

      $ pytest -v

      To run test_official (particularly useful if you made API changes), run

      $ export TEST_OFFICIAL=true

      prior to running the tests.

    • To actually make the commit (this will trigger tests for yapf, lint and pep8 automatically):

      $ git add your-file-changed.py

    • yapf may change code formatting, make sure to re-add them to your commit.

      $ git commit -a -m "your-commit-message-here"

    • Finally, push it to your GitHub fork, run:

      $ git push origin your-branch-name

  4. When your feature is ready to merge, create a pull request.

    • Go to your fork on GitHub, select your branch from the dropdown menu, and click "New pull request".
    • Add a descriptive comment explaining the purpose of the branch (e.g. "Add the new API feature to create inline bot queries."). This will tell the reviewer what the purpose of the branch is.
    • Click "Create pull request". An admin will assign a reviewer to your commit.

  5. Address review comments until all reviewers give LGTM ('looks good to me').

    • When your reviewer has reviewed the code, you'll get an email. You'll need to respond in two ways:

      • Make a new commit addressing the comments you agree with, and push it to the same branch. Ideally, the commit message would explain what the commit does (e.g. "Fix lint error"), but if there are lots of disparate review comments, it's fine to refer to the original commit message and add something like "(address review comments)".
      • In addition, please reply to each comment. Each reply should be either "Done" or a response explaining why the corresponding suggestion wasn't implemented. All comments must be resolved before LGTM can be given.

    • Resolve any merge conflicts that arise. To resolve conflicts between 'your-branch-name' (in your fork) and 'master' (in the python-telegram-bot repository), run:

      $ git checkout your-branch-name
$ git fetch upstream
$ git merge upstream/master
$ ...[fix the conflicts]...
$ ...[make sure the tests pass before committing]...
$ git commit -a
$ git push origin your-branch-name

    • If after merging you see local modified files in telegram/vendor/ directory, that you didn't actually touch, that means you need to update submodules with this command:

      $ git submodule update --init --recursive

    • At the end, the reviewer will merge the pull request.

  6. Tidy up! Delete the feature branch from both your local clone and the GitHub repository:

    $ git branch -D your-branch-name
$ git push origin --delete your-branch-name

  7. Celebrate. Congratulations, you have contributed to python-telegram-bot!

Style commandments

Assert comparison order

  • assert statements should compare in actual == expected order.

For example (assuming test_call is the thing being tested):

# GOOD
assert test_call() == 5

# BAD
assert 5 == test_call()

Properly calling callables

Methods, functions and classes can specify optional parameters (with default values) using Python's keyword arg syntax. When providing a value to such a callable we prefer that the call also uses keyword arg syntax. For example:

# GOOD
f(0, optional=True)

# BAD
f(0, True)

This gives us the flexibility to re-order arguments and more importantly to add new required arguments. It's also more explicit and easier to read.

Properly defining optional arguments

It's always good to not initialize optional arguments at class creation, instead use **kwargs to get them. It's well known Telegram API can change without notice, in that case if a new argument is added it won't break the API classes. For example:

# GOOD
def __init__(self, id, name, last_name=None, **kwargs):
   self.last_name = last_name

# BAD
def __init__(self, id, name, last_name=None):
   self.last_name = last_name