Hello. AFAIU dev-python/typing is a backport of built-in functionality from Python-3.5 and onwards to older Python versions. Without virtual one has to create rather complex dependencies in packages that support multiple Python versions, e.g. 2.7, 3.4 and 3.5. Please provide virtual/python-typing similarly how we have virtual/python-pathlib, virtual/python-futures, etc.
Could you do the background check on it and elaborate how it's supposed to be used? In particular: a. whether the module is useful for all versions of Python or only <3.5, b. whether packages can just 'import foo' that works with any version of Python, or if they need to do some magical conditionals to support both the backport and core Python.
(In reply to Michał Górny from comment #1) > a. whether the module is useful for all versions of Python or only <3.5, Only for python<3.5. It's a part of standard library in python>=3.5: https://docs.python.org/3/library/typing.html https://www.python.org/dev/peps/pep-0484/ > b. whether packages can just 'import foo' that works with any version of > Python, or if they need to do some magical conditionals to support both the > backport and core Python. I can confirm `import typing' works on 2.7 and 3.4 with dev-python/typing installed. You can confirm yourself whether `import typing' works without dev-python/typing in unstable pythons 3.5 and 3.6.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=e0282a7a71e2dc0d35f67f7381b672d8f379581b commit e0282a7a71e2dc0d35f67f7381b672d8f379581b Author: Ilya Tumaykin <itumaykin@gmail.com> AuthorDate: 2017-09-15 16:21:51 +0000 Commit: Patrice Clement <monsieurp@gentoo.org> CommitDate: 2017-09-29 09:20:51 +0000 virtual/python-typing: new virtual for the Python typing module. This module is shipped with >=dev-lang/python-3.5. dev-python/typing provides a backport for Pythons that don't have it. KEYWORDS are intersection of dev-python/typing and dev-lang/python. Closes: https://bugs.gentoo.org/628378 Package-Manager: Portage-2.3.8, Repoman-2.3.3 virtual/python-typing/metadata.xml | 8 ++++++++ virtual/python-typing/python-typing-0.ebuild | 17 +++++++++++++++++ 2 files changed, 25 insertions(+)
