Python学习笔记（十一）------异常

前言

本节介绍异常的处理方式

正文

根据输入参数拦截错误示例

import math

for i in range(10):
    try:
        inputNumber = input("write a number：")
        if inputNumber == 'q':
            break
        result = 1/math.log(float(inputNumber))
        print(result)
    #输入0报错
    except ValueError:
        print("ValueError: input must > 0")
    #输入1报错
    except ZeroDivisionError:
        print("ZeroDivisionError: input must != 0")
    except Exception:
        print("Other Exception！")

write a number：
ValueError: input must > 0

自定义异常处理类

class ChenError(ValueError):
    pass
pwdList = ['chen', 'mo']
while True:
    curInput = input("请输入密码：")
    if curInput not in pwdList:
        raise ChenError("Invalid Paasword：%s" %curInput)

请输入密码：chen2



---------------------------------------------------------------------------

ChenError                                 Traceback (most recent call last)

 in 
      5     curInput = input("请输入密码：")
      6     if curInput not in pwdList:
----> 7         raise ChenError("Invalid Paasword：%s" %curInput)


ChenError: Invalid Paasword：chen2

finally模块必被执行，与Java中作用一致

try:
    1/0
except:
    print("except！")
finally:
    print("finally！")

except！
finally！