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119 lines
3.6 KiB
ReStructuredText
119 lines
3.6 KiB
ReStructuredText
- Everything should comply with PEP8. Code should pass
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``pep8 --max-line-length=100`` without any warnings.
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- **Indenting**:
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- NEVER tabs. 4 spaces to indent.
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- follow PEP8; either hanging indent or multiline-visual indent depending
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on the size and shape of the arguments and what makes more sense to the
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author. In other words, both this::
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print("I am a fish %s" % "moo")
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and this::
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print("I am a fish %s" %
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"moo")
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and this::
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print(
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"I am a fish %s" %
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"moo",
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)
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...are valid, although given each one takes up 2x more vertical space than
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the previous, it's up to the author's discretion as to which layout makes
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most sense for their function invocation. (e.g. if they want to add
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comments per-argument, or put expressions in the arguments, or group
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related arguments together, or want to deliberately extend or preserve
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vertical/horizontal space)
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- **Line length**:
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Max line length is 79 chars (with flexibility to overflow by a "few chars" if
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the overflowing content is not semantically significant and avoids an
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explosion of vertical whitespace).
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Use parentheses instead of ``\`` for line continuation where ever possible
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(which is pretty much everywhere).
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- **Naming**:
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- Use camel case for class and type names
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- Use underscores for functions and variables.
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- Use double quotes ``"foo"`` rather than single quotes ``'foo'``.
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- **Blank lines**:
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- There should be max a single new line between:
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- statements
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- functions in a class
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- There should be two new lines between:
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- definitions in a module (e.g., between different classes)
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- **Whitespace**:
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There should be spaces where spaces should be and not where there shouldn't
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be:
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- a single space after a comma
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- a single space before and after for '=' when used as assignment
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- no spaces before and after for '=' for default values and keyword arguments.
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- **Comments**: should follow the `google code style
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<http://google.github.io/styleguide/pyguide.html?showone=Comments#Comments>`_.
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This is so that we can generate documentation with `sphinx
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<http://sphinxcontrib-napoleon.readthedocs.org/en/latest/>`_. See the
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`examples
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<http://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html>`_
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in the sphinx documentation.
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- **Imports**:
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- Prefer to import classes and functions than packages or modules.
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Example::
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from synapse.types import UserID
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...
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user_id = UserID(local, server)
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is preferred over::
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from synapse import types
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...
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user_id = types.UserID(local, server)
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(or any other variant).
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This goes against the advice in the Google style guide, but it means that
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errors in the name are caught early (at import time).
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- Multiple imports from the same package can be combined onto one line::
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from synapse.types import GroupID, RoomID, UserID
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An effort should be made to keep the individual imports in alphabetical
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order.
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If the list becomes long, wrap it with parentheses and split it over
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multiple lines.
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- As per `PEP-8 <https://www.python.org/dev/peps/pep-0008/#imports>`_,
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imports should be grouped in the following order, with a blank line between
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each group:
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1. standard library imports
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2. related third party imports
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3. local application/library specific imports
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- Imports within each group should be sorted alphabetically by module name.
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- Avoid wildcard imports (``from synapse.types import *``) and relative
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imports (``from .types import UserID``).
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