>>> import _locale
>>> _locale.__file__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module '_locale' has no attribute '__file__'. Did you mean: '__name__'?

>>> import sys
>>> sys.builtin_module_names
('_abc', '_ast', '_codecs', '_collections', '_functools', '_imp', '_io', '_locale', '_operator', '_signal', '_sre', '_stat', '_string', '_symtable', '_thread', '_tracemalloc', '_warnings', '_weakref', 'atexit', 'builtins', 'errno', 'faulthandler', 'gc', 'itertools', 'marshal', 'posix', 'pwd', 'sys', 'time', 'xxsubtype')
>>> '_locale' in sys.builtin_module_names
True

>>> import argparse # pure-python module
>>> argparse.__file__
'/usr/lib/python3.10/argparse.py'
>>> import mmap # dynamically-linked c module
>>> mmap.__file__
'/usr/lib/python3.10/lib-dynload/mmap.cpython-310-x86_64-linux-gnu.so'
>>> import gc # statically-linked c module
>>> gc.__file__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'gc' has no attribute '__file__'. Did you mean: '__name__'?