[Python-Dev] Re: When we remove 'U' mode of open()?

On Wed, 7 Apr 2021 23:44:18 +0900 Inada Naoki wrote:

On Wed, Apr 7, 2021 at 11:29 PM Miro Hrončok wrote:

...

On 07. 04. 21 14:53, Inada Naoki wrote:

...

'U' mode was removed once and resurrected. https://bugs.python.org/issue39674

As far as I can see, it is postponed to Python 3.10. Am I right? Can we remove 'U' mode in Python 3.10?

What is the benefit of doing it? Is the current compatibility layer to do nothing when "U" is passed difficult to maintain?

I am working on fileinput module:

* https://bugs.python.org/issue43712 * https://bugs.python.org/issue5758 * https://bugs.python.org/issue36865

It supports deprecated 'U' mode for now, same to builtin open(). When I read and write code and tests, I need to pay attention about all allowed combination of mode string.

You can already remove 'U' from fileinput with necessarily removing it from open(). Regards Antoine.