flake8-return

Flake8 plugin that checks return values.

Installation

pip install flake8-return

Errors

• R501 you shouldn`t add None at any return if function havn`t return value except None

def x(y):
    if not y:
        return
    return None  # error!

• R502 you should add explicit value at every return if function have return value except None

def x(y):
    if not y:
        return  # error!
    return 1

• R503 you should add explicit return at end of the function if function have return value except None

def x(y):
    if not y:
        return  # error!
    return 1

• R504 you shouldn`t assign value to variable if it will be use only as return value

def x():
    a = 1
    # some code that not using `a`
    print('test')
    return a  # error!

Returns in asyncio coroutines also supported.

License

MIT

Change Log

Unreleased

• ...

1.1.1 - 2019-09-21

• fixed #3 The R504 doesn't detect that the variable is modified in loop
• fixed #4 False positive with R503 inside async with clause

1.1.0 - 2019-05-23

• update flask_plugin_utils version to 1.0

1.0.0 - 2019-05-13

• skip assign after unpacking while unnecessary assign checking "(x, y = my_obj)"

0.3.2 - 2019-04-01

• allow "assert False" as last function return

0.3.1 - 2019-03-11

• add pypi deploy into travis config
• add make bump_version command

0.3.0 - 2019-02-26

• skip functions that consist only return None
• fix false positive when last return inner with statement
• add unnecessary assign error
• add support tuple in assign or return expressions
• add suppport asyncio coroutines

0.2.0 - 2019-02-21

• fix explicit/implicit
• add flake8-plugin-utils as dependency
• allow raise as last function return
• allow no return as last line in while block
• fix if/elif/else cases

0.1.1 - 2019-02-10

• fix error messages

0.1.0 - 2019-02-10

• initial