How does Django Know the Order to Render Form Fields?

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New to Django 1.9 is Form.field_order and Form.order_fields().

# forms.Form example
class SignupForm(forms.Form):

    password = ...
    email = ...
    username = ...

    field_order = ['username', 'email', 'password']


# forms.ModelForm example
class UserAccount(forms.ModelForm):

    custom_field = models.CharField(max_length=254)

    def Meta:
        model = User
        fields = ('username', 'email')

    field_order = ['username', 'custom_field', 'password']

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