New submission from hai shi <shihai1...@126.com>:
In master branch, `_PyWarnings_Init()` have been called twice.
```
(gdb) bt
#0 _PyWarnings_Init () at Python/_warnings.c:1338
#1 0x0000000000525df3 in pycore_init_import_warnings
(tstate=tstate@entry=0x9a19c0, sysmod=0x7ffff7f7e5f0) at
Python/pylifecycle.c:680
...
Breakpoint 1, _PyWarnings_Init () at Python/_warnings.c:1338
1338 {
(gdb) bt
#0 _PyWarnings_Init () at Python/_warnings.c:1338
#1 0x0000000000511aac in _imp_create_builtin (module=<optimized out>,
spec=0x7ffff7f2e7d0) at Python/import.c:1293
```
but in 2.7 branch, '_PyWarnings_Init()':
```
Breakpoint 1, _PyWarnings_Init() at Python/_warnings.c:886
886 m = Py_InitModule3(MODULE_NAME, warnings_functions,
warnings__doc__);
Missing separate debuginfos, use: debuginfo-install
glibc-2.17-260.el7_6.4.x86_64
(gdb) bt
#0 _PyWarnings_Init () at Python/_warnings.c:886
#1 0x00000000004fc4db in Py_InitializeEx (install_sigs=1) at
Python/pythonrun.c:242
#2 0x00000000004fcb03 in Py_Initialize () at Python/pythonrun.c:370
#3 0x00000000004154fd in Py_Main (argc=1, argv=0x7fffffffe428) at
Modules/main.c:505
#4 0x00000000004145f0 in main (argc=1, argv=0x7fffffffe428) at
./Modules/python.c:23
```
Why? because pylifecycle.c and _imp extension module will call
`_PyWarnings_Init()`.
isn't it?
----------
components: Extension Modules
messages: 362980
nosy: brett.cannon, shihai1991
priority: normal
severity: normal
status: open
title: warning extension module inited twice in python3.9
type: enhancement
versions: Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39796>
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