try: <body> except <ExceptionType1>: <handler1> ... except <ExceptionTypeN>: <handlerN> except: <handlerExcept> else: <process_else> finally: <process_finally>
# else执行的条件是try能够正常执行# finally是一定会执行无论try是否发生异常，finally总会执行try无异常，才会执行else