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)。
# 如果没有异常发生,执行此代码块(可选) print("No errors occurred") finally: # 无论是否发生异常,都会执行此代码块(通常用于清理资源) print("Cleanup or finalization code") 说明 try:标记可能抛出异常的代码块的开始。 except:捕获特定类型的异常。可以指定异常类型(如 ZeroDivisi),也可以捕获所有异常(exce...
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...
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。 如果在执行 try 子句的过程中发生了异常,那么 try 子句余下的部分将被忽略。如果异常的类型和 except 之后的名称相符,那么对应的 except 子句将被执行。 如果一个异常没有与任何的 ex...
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...
try: # Your code here except IOError: # Handle I/O errors except Exception as e: # Handle other exceptions finally: # Cleanup, runs no matter what 异常是按层次结构组织的,如果发生了IOError会执行IOError的except代码,剩下的异常则交由Exception处理。理解这个层次结构可以根据需要更广泛或更具体地捕...
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...
...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.pyexceptions=[ZeroDivisionError(),FileNotFoundError(),NameError()]num_zd_errors=num_fnf_errors=num_name_errors=0try:raiseExceptionGroup("Errors Occurred",exceptions)except*ZeroDivisionError:num_zd_errors+=1except*FileNotFoundError:num_fnf_errors+=1except*NameError:num_name_errors+=1...
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