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* fix: don't return syntax error for Annotated's metadata

PEP 593 https://www.python.org/dev/peps/pep-0593/ introduced the type Annotated, which allows to add metadata to types. By the definition only the first argument is required to be a proper type, all the other arguments are dependent on the consumer and can be other types or even literals.

This PR fixes #574.

* fix whitespace

* fix tests and formatting

* PR comments from asottile

* fix _in_annotation and remove _in_typing_annotated field

* fix test name

* get rid of _exit_annotation in favor of _entger_annotation(AnnotationState.None)

* handle Annotated in python3.9+

Co-authored-by: Anthony Sottile <asottile@umich.edu>
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README.rst

Pyflakes

A simple program which checks Python source files for errors.

Pyflakes analyzes programs and detects various errors. It works by parsing the source file, not importing it, so it is safe to use on modules with side effects. It's also much faster.

It is available on PyPI and it supports all active versions of Python: 2.7 and 3.4 to 3.8.

Installation

It can be installed with:

$ pip install --upgrade pyflakes

Useful tips:

  • Be sure to install it for a version of Python which is compatible with your codebase: for Python 2, pip2 install pyflakes and for Python3, pip3 install pyflakes.
  • You can also invoke Pyflakes with python3 -m pyflakes . or python2 -m pyflakes . if you have it installed for both versions.
  • If you require more options and more flexibility, you could give a look to Flake8 too.

Design Principles

Pyflakes makes a simple promise: it will never complain about style, and it will try very, very hard to never emit false positives.

Pyflakes is also faster than Pylint or Pychecker. This is largely because Pyflakes only examines the syntax tree of each file individually. As a consequence, Pyflakes is more limited in the types of things it can check.

If you like Pyflakes but also want stylistic checks, you want flake8, which combines Pyflakes with style checks against PEP 8 and adds per-project configuration ability.

Mailing-list

Share your feedback and ideas: subscribe to the mailing-list

Contributing

Issues are tracked on GitHub.

Patches may be submitted via a GitHub pull request or via the mailing list if you prefer. If you are comfortable doing so, please rebase your changes so they may be applied to master with a fast-forward merge, and each commit is a coherent unit of work with a well-written log message. If you are not comfortable with this rebase workflow, the project maintainers will be happy to rebase your commits for you.

All changes should include tests and pass flake8.

Build status

Changelog

Please see NEWS.rst.

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