Traceback (most recent call last):
  File "/usr/lib/python3.11/py_compile.py", line 144, in compile
    code = loader.source_to_code(source_bytes, dfile or file,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap_external>", line 1004, in source_to_code
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/in/foo.py", line 9
    procedure star;//构造计数排序优化的前向星。自己百度百科不谢。
                                 ^
SyntaxError: invalid character '。' (U+3002)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.11/py_compile.py", line 150, in compile
    raise py_exc
py_compile.PyCompileError:   File "/in/foo.py", line 9
    procedure star;//构造计数排序优化的前向星。自己百度百科不谢。
                                 ^
SyntaxError: invalid character '。' (U+3002)