In importlib a verbose message can be formatted twice, the first time before passing it to _verbose_message(), and the second time in _verbose_message(), Example:$ python -v...>>> open('{0}.pyc', 'wb').close()>>> __import__('{0}')Traceback (most recent call last):  File "<stdin>", line 1, in <module>  File "<frozen importlib._bootstrap>", line 969, in _find_and_load  File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked  File "<frozen importlib._bootstrap>", line 673, in _load_unlocked  File "<frozen importlib._bootstrap_external>", line 658, in exec_module  File "<frozen importlib._bootstrap_external>", line 869, in get_code  File "<frozen importlib._bootstrap_external>", line 440, in _validate_bytecode_header  File "<frozen importlib._bootstrap_external>", line 368, in _verbose_messageIndexError: tuple index out of rangeProposed patch fixes the issue.