pyflakes native support for Python 3

[Barry Warsaw]

Let's say you have this file:

#! /usr/bin/python
from __future__ import print_function
import sys
print('test', file=sys.stderr)

then pyflakes correct recognizes the print function and is happy. However, let's say you change the first line to

#!/usr/bin/python3

and remove the future import. Then pyflakes isn't so happy about the print() function.

No doubt it's a considerable amount of work to support Python 3 directly, but at least with this bug we can track that effort.

[Florent (florent.x)]

This branch brings Python 3 support https://github.com/florentx/pyflakes

It is based on version 0.5 from lp:divmod.org

[Florent (florent.x)]

Planned after the switch to unittest2 for the tests (https://bugs.launchpad.net/pyflakes/+bug/1097061).

The only limitation will be that you need to run with Python2 to check Python2 code, and you'll need to run with Python3 to check Python3 code.

[James (bistromathic1)]

Maybe you are aware of this (and thanks for adding python 3 support!), but there are some bits of new syntax that don't seem to be covered by this fix. The following code causes pyflakes to complain that ABCMeta is unused:

from abc import ABCMeta

class A(metaclass=ABCMeta): # new metaclass syntax
    pass

def f(a: ABCMeta): # annotations
    pass

def g(a, *args, b=ABCMeta): # defaults for keyword-only arguments
    pass

[Florent (florent.x)]

Thank you for reporting it

I will investigate these cases.

[Florent (florent.x)]

Should be fixed with latest change (rev 61).

https://github.com/pyflakes/pyflakes/commit/02864b26e590893f7effd61d96460e60ff6dec7f

Thank you

[Florent (florent.x)]

Change landed in trunk: http://bazaar.launchpad.net/~pyflakes-dev/pyflakes/master/revision/61