Python defines constants

Constants are fixed values that cannot be modified once initialized. A const reserved word is used in C + + to specify constants, while Python does not define a reserved word for constants. But Python is a powerful language, and you can define a constant class to implement the function of a constant.

const.py

1 #-*-coding:utf-8-*-2 3 class_const:4     classConsterror (TypeError):Pass5 6     def __setattr__(self, Key, value):7         #self.__dict__8         ifSelf.__dict__. Has_key (key):9             RaiseSelf. Consterror,"constant reassignment error!"TenSelf.__dict__[Key] =value One  A ImportSYS -  -sys.modules[__name__] = _const ()

Call

test.py, so it can be used, this value cannot be changed

Import= 10000

Python defines constants