On 24. 01. 20 5:59, Ethan Furman wrote:
My understanding is that this postponement of removals is aimed at those who
have just migrated to Python 3, not those who have already done it nor those who
have 2/3 straddling code bases.
No, the motivation to pospone the changes to 3.10 are projects that alrady
support both 2 and 3 at the same time, with or without compatibility libraries
like six. Before they had anough time to make the necessary actions to abandon
Python 2.7, we ask them to support 3.9 from the same code base. Hence, they need
to replace simple code:
from collections import Sequence
With either:
try:
from collections.abc import Sequence
except ImprotError:
# Python 2.7 doesn't have collections.abc
from collections import Sequence
Or:
from compatlib.moves.collections_abc import Sequence
In both cases, we move the burden of having a compatibility layer of some sort
from one central location (Python 3.9 stdlib) to dozens (hundreds?) locations.
For those who have been on 3 for a while,
updating to use the newer APIs for 3.9 vs 3.10 shouldn't make a difference.
For Python 3 only projects? No, no difference.
Like-wise for those with 2/3 straddling code bases (we'll just need to add a few
more things to our shims).
And our point is that because it's too early in 2020 to drop Python 2 code, it
is better to encourage projects to update the code as Python 3 only in a year
than to let them add more shims now just to hopefully remove them in couple months.
Anyone who hasn't supported/used Python 3 until now
shouldn't have a problem with sticking with 3.8 until they are ready to make
more adjustments, and those who have had to keep Python 2 around to run those
applications/frameworks/whatevers will, I should think, be thrilled to use any
Python 3 instead. :-)
This does not affect projects who don't support Python 3 yet.
--
Miro Hrončok
--
Phone: +420777974800
IRC: mhroncok
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