不，无论是否有例外，
finally时间
sys.exc_info都是无。采用：
try: whateverexcept: here sys.exc_info is valid to re-raise the exception, use a bare `raise`else: here you know there was no exceptionfinally: and here you can do exception-independent finalization
不，无论是否有例外，
finally时间
sys.exc_info都是无。采用：
try: whateverexcept: here sys.exc_info is valid to re-raise the exception, use a bare `raise`else: here you know there was no exceptionfinally: and here you can do exception-independent finalization
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