carla/Docs/coding_standard.md

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<h1>Coding standard</h1>
> _This document is a work in progress and might be incomplete._
General
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* Use spaces, not tabs.
* Avoid adding trailing whitespace as it creates noise in the diffs.
Python
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* Comments should not exceed 80 columns, code should not exceed 120 columns.
* All code must be compatible with Python 2.7, 3.5, and 3.6.
* [Pylint][pylintlink] should not give any error or warning (few exceptions
apply with external classes like `numpy` and `pygame`, see our `.pylintrc`).
* Python code follows [PEP8 style guide][pep8link] (use `autopep8` whenever
possible).
[pylintlink]: https://www.pylint.org/
[pep8link]: https://www.python.org/dev/peps/pep-0008/
C++
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* Comments should not exceed 80 columns, code may exceed this limit a bit in
rare occasions if it results in clearer code.
* Compilation should not give any error or warning
(`clang++-7 -Wall -Wextra -std=C++14 -Wno-missing-braces`).
* The use of `throw` is forbidden, use `carla::throw_exception` instead.
* Unreal C++ code (CarlaUE4 and Carla plugin) follow the
[Unreal Engine's Coding Standard][ue4link] with the exception of using
spaces instead of tabs.
* LibCarla uses a variation of [Google's style guide][googlelink].
* Uses of `try-catch` blocks should be surrounded by
`#ifndef LIBCARLA_NO_EXCEPTIONS` if the code is used in the server-side.
[ue4link]: https://docs.unrealengine.com/latest/INT/Programming/Development/CodingStandard/
[googlelink]: https://google.github.io/styleguide/cppguide.html