如果当try后的语句执行时发生异常,python就跳回到try并执行第一个匹配该异常的except子句,异常处理完毕,控制流就通过了整个try语句(除非在处理异常时又引发新的异常)。 如果在try后的语句里发生了异常,却没有匹配的except子句,异常将被递交到上层的try,或者到程序的最上层(这样将结束程序,并打印缺省的出错信息)。
div(1, 2)#Mutiple exception in one linetry:print(a /b)except(ZeroDivisionError, TypeError) as e:print(e)#Except block is optional when there is finallytry: open(database)finally: close(database)#catch all errors and log ittry: do_work()except:#get detail from logging modulelogging.excep...
The plain try-except block will catch any type of error. But, we can be more specific. For instance, we may be interested in only a particular type of error or want to handle different types of error differently. The type of error can be specified with the except statement. Consider the...
raise MyCriticalError("A critical error") except Exception as e: print("This will not catch MyCriticalError")19、优雅的处理用户和系统中断 捕获KeyboardInterrupt和SystemExit异常,以优雅地处理用户或系统启动的关机。 import sys try: while True: continue except KeyboardInterrupt: print("User interrupted t...
try: x=int(input("请输入一个数字: ")) break exceptValueError: print("您输入的不是数字,请再次尝试输入!") try 语句按照如下方式工作; 首先,执行 try 子句(在关键字 try 和关键字 except 之间的语句)。 如果没有异常发生,忽略 except 子句,try 子句执行后结束。
(1, 2) # Mutiple exception in one line try: print(a / b) except (ZeroDivisionError, TypeError) as e: print(e) # Except block is optional when there is finally try: open(database) finally: close(database) # catch all errors and log it try: do_work() except: # get detail from ...
...raiseBad()#raise an instance...>>>try: ... doomed() ...exceptBad:#catch class name...print"got Bad"... got Bad>>> 3.5 终止行为 (Termination Actions) Finally,trystatements can say "finally"-- that is, they may include finally blocks. These look like except handlers for excepti...
# catch_all.py exceptions = [ZeroDivisionError(), FileNotFoundError(), NameError()] num_zd_errors = num_fnf_errors = num_name_errors = 0 try: raise ExceptionGroup("Errors Occurred", exceptions) except* ZeroDivisionError: num_zd_errors += 1 except* FileNotFoundError: num_fnf_errors +=...
117. 118. 119. 120. 121. 122. 123. 124. 125. 126. 127. 128. 129. 130. 131. 132. 133. 134. 135. 136. log.error() 一般是需要if()的; log.info()一般是在try catch 里面 log.debug() 做记录一般标志着方法的开始和结束。
try:do_something()except Exception:# THis will catch any exception!print("Something terrible happened") 为了合理准确的定义你的异常类,这里有一些规范与编程技巧,你可以做为参照: 必须继承 Exception类: class MyOwnError(Exception): pass 利用前面提到的BaseException.str: 它将传递给BaseException.init方法的...