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warn_explicit() issues a warning or an error when used directly in a script #123011
Description
For example, running the following script:
import warnings
warnings.warn_explicit('eggs', UserWarning, 'bar', 1, module_globals=globals())emits a warning:
$ ./python t.py
<frozen importlib._bootstrap_external>:932: DeprecationWarning: Module globals is missing a __spec__.loader
/home/serhiy/py/cpython3.13/t.py:1: UserWarning: eggs
import warnings
Running it as a module produces an error:
$ ./python -m t
Traceback (most recent call last):
File "/home/serhiy/py/cpython3.13/Lib/runpy.py", line 198, in _run_module_as_main
return _run_code(code, main_globals, None,
"__main__", mod_spec)
File "/home/serhiy/py/cpython3.13/Lib/runpy.py", line 88, in _run_code
exec(code, run_globals)
~~~~^^^^^^^^^^^^^^^^^^^
File "/home/serhiy/py/cpython3.13/t.py", line 2, in <module>
warnings.warn_explicit('eggs', UserWarning, __file__, 1, module_globals=globals())
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "<frozen importlib._bootstrap_external>", line 1073, in get_source
File "<frozen importlib._bootstrap_external>", line 674, in _check_name_wrapper
ImportError: loader for t cannot handle __main__
Running it in the REPL produces similar error:
>>> import warnings
... warnings.warn_explicit('eggs', UserWarning, 'bar', 1, module_globals=globals())
...
Traceback (most recent call last):
File "<python-input-0>", line 2, in <module>
warnings.warn_explicit('eggs', UserWarning, 'bar', 1, module_globals=globals())
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "<frozen importlib._bootstrap_external>", line 1073, in get_source
File "<frozen importlib._bootstrap_external>", line 674, in _check_name_wrapper
ImportError: loader for _pyrepl.__main__ cannot handle __main__But importing it as a module is OK:
>>> import t
/home/serhiy/py/cpython3.13/t.py:1: UserWarning: eggs
import warningsThe warning was introduced in #86298, but I think that it was for modules created in non-standard way. Running Python code as a script is pretty standard, this is not a user error. We should handle this case specially.
cc @brettcannon, @warsaw
Linked PRs
- gh-123011: Fix warn_explicit() with the globals of the __main__ module #155318
- [3.15] gh-123011: Fix warn_explicit() with the globals of the __main__ module (GH-155318) #155989
- [3.14] gh-123011: Fix warn_explicit() with the globals of the __main__ module (GH-155318) #155990
- [3.13] gh-123011: Fix warn_explicit() with the globals of the __main__ module (GH-155318) #155991
Activity
gh-123011: Fix warn_explicit() with the globals of the __main__ module (
[3.13] gh-123011: Fix warn_explicit() with the globals of the __main_…
[3.14] gh-123011: Fix warn_explicit() with the globals of the __main_…
[3.15] gh-123011: Fix warn_explicit() with the globals of the __main_…