每个异常都是一 些类的实例，这些实例可以被引发，并且可以用很多种方法进行捕捉，使得程序可以捉住错误并且对其进行处理
>>> 1/0 traceback (most recent call last): file "<pyshell#0>", line 1, in <module> 1/0 zeropisionerror: integer pision or modulo by zero
异常处理
捕捉异常可以使用try/except语句。
>>> def inputnum(): x=input('enter the first number: ') y=input('enter the first number: ') try: print x/y except zerodivisionerror: print "the second number can't be zero" >>> inputnum() enter the first number: 10 enter the first number: 0 the second number can't be zero
raise 触发异常
>>> class muff: muffled=false def calc(self,expr): try: return eval(expr) except zerodivisionerror: if self.muffled: print 'division by zero is illegal' else: raise >>> c=muff() >>> c.calc(10/2) traceback (most recent call last): file "<pyshell#33>", line 1, in <module> c.calc(10/2) file "<pyshell#31>", line 5, in calc return eval(expr) typeerror: eval() arg 1 must be a string or code object >>> c.calc('10/2') >>> c.calc('1/0') traceback (most recent call last): file "<pyshell#35>", line 1, in <module> c.calc('1/0') file "<pyshell#31>", line 5, in calc return eval(expr) file "<string>", line 1, in <module> zerodivisionerror: integer pision or modulo by zero >>> c.muffled=true >>> c.calc('1/0') division by zero is illegal
多种异常类型
try: x=input('enter the first number:') y=input('enter the seconed number:') print x/y except zerodivisionerror: print "the second number can't be zero!" except typeerror: print "that wasn't a number,was it?"
同时 捕捉多个异常
try: x=input('enter the first number:') y=input('enter the seconed number:') print x/y except(zerodivisionerror,typeerror,nameerror): print 'your numbers were bogus...'
捕捉对象
try: x=input('enter the first number:') y=input('enter the seconed number:') print x/y except(zerodivisionerror,typeerror),e: print e enter the first number:1 enter the seconed number:0 integer pision or modulo by zero
捕捉所有异常
try: x=input('enter the first number:') y=input('enter the seconed number:') print x/y except: print 'something wrong happened...' enter the first number: something wrong happened...
以上就是关于python中异常的详细说明的详细内容。