Make the math module an extension package #140824

it might be simpler to convert the _math and _math_integer extensions to builtins. not sure it would actually solve what you want to solve though.

it might be simpler to convert the _math and _math_integer extensions to builtins. not sure it would actually solve what you want to solve though.

I don't think that converting these extensions to built-in extensions would solve the problem of functions __module__ set to the wrong module.

I created #141363 to solve this problem: implement the math package in Python.

cc @skirpichev

I created #141363 to solve this problem

Sorry, I don't think it's a good alternative to the current hack. It's just a different hack.

math.integer is missing from sys.stdlib_module_names:

>>> import sys
>>> 'math.integer' in sys.stdlib_module_names
False

math.integer is missing from sys.stdlib_module_names

FTR, this is expected per the doc.

math.integer is missing from sys.stdlib_module_names

The problem is that the _Py_DumpExtensionModules() function considers that math.integer is not part of the stdlib. Example with faulthandler on a crash:

$ ./python -X faulthandler
>>> import math.integer
>>> import ctypes
>>> ctypes.string_at(0)
Fatal Python error: Segmentation fault

Current thread 0x00007f01b0b2a780 [python] (most recent call first):
  File "/home/vstinner/python/main/Lib/ctypes/__init__.py", line 607 in string_at
  ...

Current thread's C stack trace (most recent call first):
  Binary file "./python", at _Py_DumpStack+0x31 [0x674654]
  ...

Extension modules: math.integer (total: 1)

FTR, this is expected per the doc.

_Py_DumpExtensionModules() should be update to ignore math.integer.

_Py_DumpExtensionModules() should be update to ignore math.integer.

This also will be solved, if we remove math.integer from sys.stdlib_module_names.

I wrote a fix for _Py_DumpExtensionModules(): #144339 ignores math.integer since math is part of sys.stdlib_module_names.