python 异常处理

def count_word(filename):
    try:
        with open(filename,encoding='utf-8') as file:
            centent=file.read()
    except FileNotFoundError:
        print('filename '+filename+ ' does not exist')
    else:
        new_words=centent.split()
        print(filename+" has about "+str(len(new_words))+' words')
count_word('python_study')

def division():
    while True:
        try:
            num1=int(input('请输入数字：'))
            num2=int(input('请输入数字：'))
            res=num1/num2
        except ValueError as ve:
            print('请输入数字！')
            print(ve)
        except ZeroDivisionError as ze:
            print('除数不能为零')
            print(ze)
        else:
            return res
        finally:
            print('test')#不论是否异常都会执行
print(division())

def division():
    while True:
        try:
            num1=int(input('请输入数字：'))
            num2=int(input('请输入数字：'))
            res=num1/num2
        except Exception as e:#所有异常都可以捕捉到
            print(e)
        else:
            return res
        finally:
            print('test')#不论是否异常都会执行
print(division())