+
−"""
+
−21. Specifying 'choices' for a field
+
−
+
−Most fields take a ``choices`` parameter, which should be a tuple of tuples
+
−specifying which are the valid values for that field.
+
−
+
−For each field that has ``choices``, a model instance gets a
+
−``get_fieldname_display()`` method, where ``fieldname`` is the name of the
+
−field. This method returns the "human-readable" value of the field.
+
−"""
+
−
+
−from django.db import models
+
−
+
−GENDER_CHOICES = (
+
−    ('M', 'Male'),
+
−    ('F', 'Female'),
+
−)
+
−
+
−class Person(models.Model):
+
−    name = models.CharField(maxlength=20)
+
−    gender = models.CharField(maxlength=1, choices=GENDER_CHOICES)
+
−
+
−    def __str__(self):
+
−        return self.name
+
−
+
−__test__ = {'API_TESTS':"""
+
−>>> a = Person(name='Adrian', gender='M')
+
−>>> a.save()
+
−>>> s = Person(name='Sara', gender='F')
+
−>>> s.save()
+
−>>> a.gender
+
−'M'
+
−>>> s.gender
+
−'F'
+
−>>> a.get_gender_display()
+
−'Male'
+
−>>> s.get_gender_display()
+
−'Female'
+
−"""}