Lista de estados de México, formato tupla

estados.py

# -*- coding: utf-8 -*-
"""
lista de estados de la Mexico
"""

AGC = "Aguascalientes"
BCN = "Baja California Norte"
BCS = "Baja California Sur"
CAMP = "Campeche"
CHI ="Chiapas"
CHIH ="Chihuahua"
COA ="Coahuila"
COL ="Colima"
DF ="Distrito Federal"
DUR ="Durango"
EM ="Estado de Mexico"
GTO ="Guanajuato"
GRO ="Guerrero"
HDO ="Hidalgo"
JCO ="Jalisco"
MCH ="Michoacan"
MRO ="Morelos"
NRT ="Nayarit"
NLN ="Nuevo Leon"
OXC ="Oaxaca"
PUE ="Puebla"
QRT ="Queretaro"
QTR ="Quintana Roo"
SNL ="San Luis Potosi"
SIN ="Sinaloa"
SNR ="Sonora"
TBC ="Tabasco"
TMP ="Tamaulipas"
TXL ="Tlaxcala"
VER ="Veracruz"
YCT ="Yucatan"
ZAC ="Zacatecas"
ESTADO_OPTIONS = (
  (AGC, "Aguascalientes"),
  ( BCN, "Baja California Norte"),
  ( BCS, "Baja California Sur"),
  ( CAMP, "Campeche"),
  ( CHI,"Chiapas"),
  ( CHIH,"Chihuahua"),
  ( COA,"Coahuila"),
  ( COL,"Colima"),
  ( DF,"Distrito Federal"),
  ( DUR,"Durango"),
  ( EM,"Estado de Mexico"),
  ( GTO,"Guanajuato"),
  ( GRO,"Guerrero"),
  ( HDO,"Hidalgo"),
  ( JCO,"Jalisco"),
  ( MCH,"Michoacan"),
  ( MRO,"Morelos"),
  ( NRT,"Nayarit"),
  ( NLN,"Nuevo Leon"),
  ( OXC,"Oaxaca"),
  ( PUE,"Puebla"),
  ( QRT,"Queretaro"),
  ( QTR,"Quintana Roo"),
  ( SNL,"San Luis Potosi"),
  ( SIN,"Sinaloa"),
  ( SNR,"Sonora"),
  ( TBC,"Tabasco"),
  ( TMP,"Tamaulipas"),
  ( TXL,"Tlaxcala"),
  ( VER,"Veracruz"),
  ( YCT,"Yucatan"),
  ( ZAC,"Zacatecas"),
  )

tuapp/models.py

from tuapp.estados import ESTADO_OPTIONS
....
estado = models.CharField(max_length=50, choices=ESTADO_OPTIONS)