1.定义常量类constant.py
# -*- coding: utf-8 -*
"""常量工具类 author: Jill usage：
from constant import _Const
const = _Const()
const.PI = 3.14
""" class _Const:
class ConstError(TypeError):
pass class ConstCaseError(ConstError):
pass def __setattr__(self, name, value):
if name in self.__dict__:
raise self.ConstError("Can't change const(%s) value" % name)
if not name.isupper():
raise self.ConstCaseError("Const name %s is not all uppercase" % name) self.__dict__[name] = value def __getitem__(self, key):
if key in self.__dict__:
return self.__dict__[key]
else:
raise self.ConstError("Can't return const %s, No Existing Key!" % key) def __delattr__(self, name):
if name in self.__dict__:
raise self.ConstError("Can't unbind const(%s)" % name)
raise NameError(name)
2.将常量放在一个模块中common_constant.py
# -*- coding: utf-8 -*
"""常用常量定义 author: Jill usage：
from common_constant import const
print(const.ROOT_PATH)
"""
from common.constant import _Const const = _Const() const.PI = 3.14 if __name__ == "__main__":
print(const.PI)
print(const['PI'])
3.在其他模块里使用test.py
from common_constant import const print(const.ROOT_PATH)