Python except 关键字
定义和用法
在 try ... except 块中使用了关键字 except。它定义 try 块引发错误时要运行的代码块。
您可以为不同的错误类型定义不同的块,以及没有问题的情况下执行的块,请参见下面的例子。
更多实例
实例 1
如果引发 NameError 则写一条消息,如果引发 TypeError 则写另一条:
x = "hello" try: x > 3 except NameError: print("You have a variable that is not defined.") except TypeError: print("You are comparing values of different type")
实例 2
尝试执行一条引发错误的语句,但没有定义的错误类型(在这种情况下为 ZeroDivisionError):
try: x = 1/0 except NameError: print("You have a variable that is not defined.") except TypeError: print("You are comparing values of different type") except: print("Something else went wrong")
实例 3
如果没有出现错误,写一条消息:
x = 1 try: x > 10 except NameError: print("You have a variable that is not defined.") except TypeError: print("You are comparing values of different type") else: print("The 'Try' code was executed without raising any errors!")