8.3. 自定义异常类¶
8.3.1. 举例1¶
#!/usr/bin/env python
#-*- coding:utf8 -*-
#继承Exception类
class MyError(Exception):
pass
#需要异常类有一定的提示信息,可以重载__init__和__str__两个方法
class RangeError(Exception):
def __init__(self,value):
self.value = value
def __str__(self):
return self.value
if __name__ == '__main__':
raise RuntimeError("Range Error....!") #调用raise 抛出异常
8.3.2. 举例2¶
#!/usr/bin/env python
# -*- coding:utf8 -*-
# auther; 18793
# Date：2019/9/8 21:07
# filename: 07.自定义异常.py
class MyError(Exception):
def __init__(self):
pass
def __str__(self):
return "this is self define error"
def my_error_test():
try:
raise MyError()
except MyError as e:
print("Exception info: ", e)
my_error_test() # Exception info: this is self define error
8.3.3. 举例3¶
#自定义异常
class xError(Exception):
def __init__(self,value):
self.value=value
def __str__(self):
return repr(self.value)
#定义一个会抛出xError的方法
def call(xName):
if xName=='牛牛':
raise xError('严重错误！不许给牛牛打电话！：P')
else:
print('确定要给',repr(name),"打电话吗？")
#调用call方法
try:
name=input("请问您要跟谁打电话？")
call(name)
except xError as e:
print(e.value)
raise
8.3.4. 举例4¶
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
class MyError(Exception):
def __str__(self):
return "I'am a self-defiend Error!!!"
def main():
try:
print("************* start of main() ****************")
if len(sys.argv) == 1:
raise MyError
print("************* End of main() ****************")
except MyError as e:
print(e)
if __name__ == '__main__':
main()
# $ python 03.py
# ************* start of main() ****************
# I'am a self-defiend Error!!!
# $ python 03.py 11
# ************* start of main() ****************
# ************* End of main() ****************