On 11/14/2017 3:26 PM, Ivan Levkivskyi wrote:
After some discussion on python-ideas, see
https://mail.python.org/pipermail/python-ideas/2017-September/047220.html,
this PEP received positive comments. The updated version that takes into
account the comments that appeared in the discussion so far is available
at https://www.python.org/dev/peps/pep-0560/
Here I post the full text for convenience:
++++++++++++++++++++++++++
PEP: 560
Title: Core support for typing module and generic types
Author: Ivan Levkivskyi <levkivs...@gmail.com <mailto:levkivs...@gmail.com>>
Status: Draft
Type: Standards Track
Content-Type: text/x-rst
Created: 03-Sep-2017
Python-Version: 3.7
Post-History: 09-Sep-2017
...
Suggested wording improvements:
Performance
-----------
The ``typing`` module is one of the heaviest and slowest modules in
the standard library even with all the optimizations made.
Mainly this is
because of subscripted generic types (see PEP 484 for definition of terms
used in this PEP) are class objects (see also [1]_).
Delete 'of' after 'because' to make this a proper sentence.
The three main ways how
"There are three ..." reads better to me.
the performance can be improved with the help of the proposed special
methods:
- Creation of generic classes is slow since the ``GenericMeta.__new__`` is
very slow; we will not need it anymore.
- Very long MROs for generic classes will be twice shorter;
I believe by 'twice shorter', which is meaningless by itself, you mean
'half as long'. If so, please say the latter.
> they are present
because we duplicate the ``collections.abc`` inheritance chain
in ``typing``.
- Time of instantiation of generic classes will be improved
Instantiation of generic classes will be faster.
(this is minor however).
--
Terry Jan Reedy
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