Python-future: Fixer to remove __future__/future imports from futurized code

Created on 28 May 2019  ·  5Comments  ·  Source: PythonCharmers/python-future

I was looking for this feature, but didn't see it in the documentation so I'm opening a feature request.

I'd love to see a fixer which takes Python 2/3 compatible code and removes the Python 2 support as best as possible.

This would:

  • Remove unnecessary __future__ imports (print_function for example)
  • Remove from future import standard_library and standard_library.install_aliases() lines
  • Remove from builtins import * lines
  • Remove from future.utils import python_2_unicode_compatible

If such a fixer already exists, I'd love to know about it.

A number of my clients are using future to upgrade their code to Python 3 and then dropping Python 2 support shortly afterward and such a fixer would be very helpful for them.

futurize script help wanted unscheduled wontfix / cantfix
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picture treyhunner
👍6

Most helpful comment

I made some transformations myself and bundled them up into a script. It's currently available here: https://github.com/purplediane/drop2

picture treyhunner on 24 Jun 2019
👍3

All 5 comments

If it exists, then it's not documented well. I had to manually remove all that. Use of a fixture that auto-ran maybe with a flag such as -3 to mean only refactor for 3 compliance and ignore python2 compatibility would be great.

WSLUser picture WSLUser on 29 May 2019

I made some transformations myself and bundled them up into a script. It's currently available here: https://github.com/purplediane/drop2

treyhunner picture treyhunner on 24 Jun 2019
👍3

A related tool, with some overlap (namely __future__ imports):

asottile/pyupgrade: A tool (and pre-commit hook) to automatically upgrade syntax for newer versions of the language.

Other notable things:

  • Removes u prefix
  • Removes (object) from class definitions
  • Updates super() calls
  • Updates mock imports

That said, I was able to use sed for standard_library:

sed -i '' '/.*standard_library.*/d' **/*.py

-from future import standard_library
-standard_library.install_aliases()
 import json
 import logging
 import urllib.parse

I'm planning to do the same for:

  • .*python_2_unicode_compatible.*
  • .*implements_iterator.*
  • from builtins.*
bhrutledge picture bhrutledge on 20 May 2020

I'm already aware of pyupgrade and have used it. It is very helpful.

WSLUser picture WSLUser on 20 May 2020

pyupgrade (plus the pre-commit hook) is a great tool for this purpose. Can we close this FR since the alternative is available?

sfdye picture sfdye on 9 Jun 2020
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