New submission from Ivan Levkivskyi:
The idea is that creating ABCs is approximately twice slower than normal
classes. Plus there are smaller penalties for various operations with ABCs.
This mostly influences the Python interpreter start-up time (because of
extensive use of ABCs in importlib), and start-up times of programs that
extensively use ABCs.
The situation can be improved by rewriting ABCMeta in C. I have a working
implementation, but it is far form being ready and still needs some polishing
and optimizations (in particular _abc_cache and friends).
Already at this stage I have one question (I will add more when they appear
while I am finishing the implementation): is it OK to make _abc_cache,
_abc_negative_cache, _abc_negative_cache_version, and _abc_registry read-only?
The point is that I want to prohibit something like this:
MyABC._abc_cache = "Surprise on updating the cache!"
thus avoiding many PySet_Check(...) calls. These attributes are not documented
and start with underscore.
----------
components: Extension Modules, Library (Lib)
messages: 301198
nosy: barry, levkivskyi
priority: normal
severity: normal
status: open
title: Implement ABCMeta in C
type: performance
versions: Python 3.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue31333>
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