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client/doc/developing/coding-style.rst

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+Coding style
+============
+
+Knowledge of Python is a obviously a must to develop a Python library.
+A good online resource is `Dive Into Python 3 <http://www.diveintopython3.net/>`_.
+
+Telethon uses multiple tools to automatically format the code and check for linting rules.
+This means you can simply ignore formatting and let the tools handle it for you.
+You can find these tools under the ``tools/`` folder.
+
+The documentation is written with mostly a newline after every period.
+This is not a hard rule.
+Lines can be cut earlier if they become too long to be comfortable.
+
+Commit messages should be short and descriptive.
+They should start with an action in the present ("Fix" and not "Fixed").
+This saves a few characters and represents what the commit will "do" after applied.