Python: 在不可寻址的流上,identify_stream() 会引发 UnboundLocalError,而不是真正的 OSError

Rust/src/magika/magika.py:203-209:

try:
    current_position = stream.tell()
    result = self._get_result_from_seekable(Seekable(stream))
finally:
    # seek to the previous position even in case of exceptions
    stream.seek(current_position)
return result

current_position is bound inside the try block but referenced unconditionally in finally. When the first statement (stream.tell()) raises, the name was never bound, so finally raises UnboundLocalError and replaces the real exception.