获取django model 中得fields

UserProfile._meta.fields

[<django.db.models.fields.related.OneToOneField: user>,
 <django.db.models.fields.CharField: username>, 
<django.db.models.fields.CharField: nickname>, 
<django.db.models.fields.EmailField: email>, 
<django.db.models.fields.BooleanField: is_mail_verified>,

params = UserProfile._meta.fields
for t in range(len(params)):
        print params[t].name, params[t].verbose_name, params[t]._choices#获取model中的choicesfield