python拾遗【2】自定义异常类

Python中自定义异常类，继承Exception类即可:

class NetworkError(Exception): pass

如果需要重载__init__()方法，则需要提供两个参数：

class DeviceError(Exception):
    def __init__(self,errno,msg):
        self.args = (errno, msg)
        self.errno = errno
        self.errmsg = msg

# Raises an exception (multiple arguments)
raise DeviceError(1, 'Not Responding')