python自定义异常类方式

#一般都会让异常继承这个类，（或者是更高级的BaseException）
#默认大家知道__init__和__str__
class NotEqual(Exception):
    def __init__(self, msg):
        self.msg = msg
    def __str__(self):
        return self.msg
class OPT():
    def test_suit(self, a):
        if a > 10:
            return True
        else:
            return False
    def test(self):
        try:
            if ( (True != self.test_suit(5)) or
                 (True != self.test_suit(15)) ):
            #raise表示抛出异常，后面必须是定义过的异常类，
            #括号中的内容是大家想让程序打印的内容
                raise NotEqual("not equal")    
        except NotEqual as e:
            print("{}".format(e))
if __name__ == '__main__':
    option = OPT()
    option.test()
#运行结果
>>>$ python test.py
>>>  not equal

class CustomException(Exception):
    """
    Customized Exception
    Exception raised for errors in the input salary.
    Attributes:
        msg  -- error message
        code -- error attribution
    """
    msg, code = "", 0
    def __init__(self, **kwargs):
        for k, v in kwargs.items():
            setattr(self, k, v)
class UnknownException(CustomException):
    code = 100
class ItemClickFailedException(CustomException):
    """
    clickable item clicking failed
    """
    msg = "failed to click item"
    code = 1
class ItemNotFoundException(CustomException):
    """
    clickable item not found
    """
    msg = "clickable item not found"
    code = 2

 def random_click(self, item, items) -> Info:
      if len(items) == 0:
          raise ItemClickFailedException()
      if not self.is_clickable(item):
          raise ItemClickFailedException(msg="item is not visible")
      item_attr, item_rect = self.click_item(item)
      return Info(result=True, area=item_attr, x=item_rect.center[0], y=item_rect.center[1], error=[])

def click(self, item, items) -> ClickInfo:
    error_list = []
    try:
        result: ClickInfo = self.random_click(item, items)
    except Exception as e:
        # 此时捕获到的是具体的异常类实例
        error_list.append(e)
    for error in error_list:
        print("msg={}, code={}".format(error.msg, error.code))

msg=item is not visible, code=2

msg=failed to click item, code=1