Pythonで定数

Python 3.4以降

code:const.py

from enum import Enum, unique # uniqueデコレータで値の重複を許さないようにできる

@unique

class Const(Enum);

HOGE = 1

FOO = 2

BAR = 3

code:const.py

class _consttype:

class _ConstTypeError(TypeError):

pass

def __repr__(self):

return "Constant type definitions."

def __setattr__(self, name, value):

v = self.__dict__.get(name, value)

if type(v) is not type(value):

raise self._ConstTypeError, "Can't rebind %s to %s" % (type(v), type(value))

def __del__(self):

self.__dict__.clear()

import sys

code:const.py

class _const:

class ConstError(TypeError): pass

def __setattr__(self, name, value):

if self.__dict__.has_key(name):

raise self.ConstError, "Can't rebind const(%s)"%name

def __delattr__(self, name):

if self.__dict__.has_key(name):

raise self.ConstError, "Can't unbind const(%s)"%name

raise NameError, name

import sys