ChoiceField doesn't display an empty label when using a tuple

I've found a solution that works the way I want it to without violating the DRY principle. Not very clean, but it'll have to do I suppose.

According to the documentation choices don't have to be a tuple:

Finally, note that choices can be any iterable object -- not necessarily a list or tuple. This lets you construct choices dynamically. But if you find yourself hacking choices to be dynamic, you're probably better off using a proper database table with a ForeignKey. choices is meant for static data that doesn't change much, if ever.

So the solution I'm going with for the moment is:

COMPETITION_TYPE_CHOICES = [     (1, 'Olympic Games'),     (2, 'ISU Championships'),     (3, 'Grand Prix Series'),]COMP_TYPE_CHOICES_AND_EMPTY = [('','All')] + COMPETITION_TYPE_CHOICES

And then:

class CompetitionSearchForm(forms.Form):    name = forms.CharField(required=False)    type = forms.ChoiceField(choices=COMP_TYPE_CHOICES_AND_EMPTY, required=False)

The model stays the same as it was.

I tried both Monika's and Evgeniy's solutions with no success, but Monika has a good point in that the choices do not need to be tuples. Therefore, the easiest (and DRYest) solution is to simply do what Django does already in the Model Field. Simply add the blank choice and the tuples together after converting them to a list:

from django.db.models.fields import BLANK_CHOICE_DASH...type = forms.ChoiceField(choices=BLANK_CHOICE_DASH + list(COMPETITION_TYPE_CHOICES), required=False)

Better choice is to update field choices in form init method

COMPETITION_TYPE_CHOICES = (    (1, 'Olympic Games'),    (2, 'ISU Championships'),    (3, 'Grand Prix Series'),)class CompetitionSearchForm(forms.Form):    name = forms.CharField(required=False)    type = forms.ChoiceField(choices=COMPETITION_TYPE_CHOICES,required=False)    def __init__(self, *args, **kwargs):        super(CompetitionSearchForm, self).__init__(*args, **kwargs)        self.fields['type'].choices.insert(0, ('','---------' ) )