Hi, I proposed a second change to restore the "U" open() mode (universal newlines): https://github.com/python/cpython/pull/18767 Again, it's only kept in Python 3.9 to ease migration from Python 2, but will be removed in Python 3.10. By the way, I also added a new "You should check for DeprecationWarning in your code" section to "What's New In Python 3.9" document, to strongly advice users to check for deprecation warnings in their code: https://docs.python.org/dev/whatsnew/3.9.html#you-should-check-for-deprecati... Victor Le mar. 18 févr. 2020 à 12:37, Victor Stinner <vstinner@python.org> a écrit :
Hi,
I created an issue:
"Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10" https://bugs.python.org/issue39674
And proposed a first pull request to add again collections.Mapping:
https://github.com/python/cpython/pull/18545
Victor