This change prevents fixers from changing the tree unnecessarily, which results in no visible diff and the file still being reported as needing modifications (as described in bpo-41110).
This partially addresses an issue in python-modernize where a non-zero exit code is returned even when no changes to files need to be made: python-modernize/python-modernize#161
amyreese
commented
4 years ago
Description
This change prevents fixers from changing the tree unnecessarily, which results in no visible diff and the file still being reported as needing modifications (as described in bpo-41110).
This partially addresses an issue in python-modernize where a non-zero exit code is returned even when no changes to files need to be made: python-modernize/python-modernize#161
This exists as a pull request to cpython as well: https://github.com/python/cpython/pull/21296