为什么__loader__.load_module第一次导入模块失败，第二次成功

Question

Python 3.10.6 (main, Mar 10 2023, 10:55:28) [GCC 11.3.0] on linux
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>>> __loader__.load_module("subprocess").run(["whoami"])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<frozen importlib._bootstrap>", line 290, in _load_module_shim
  File "<frozen importlib._bootstrap>", line 719, in _load
  File "<frozen importlib._bootstrap>", line 674, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 571, in module_from_spec
  File "<frozen importlib._bootstrap>", line 774, in create_module
ImportError: 'subprocess' is not a built-in module
>>> __loader__.load_module("subprocess").run(["whoami"])
root
CompletedProcess(args=['whoami'], returncode=0)
>>> 

我不太明白为什么会这样。如果我想在 PyCharm 中编写代码，我该如何使用 load.load_module 因为它总是会失败