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Good news! This is actually pretty easy. In your template, make sure you include JQuery as follows:
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.mask/1.14.10/jquery.mask.js"></script>
Then when creating a form field, simply pass the input mask into a field like so:
contact_number = forms.CharField(widget=forms.TextInput(attrs={'data-mask':"000-000-0000"}))
Or if you’re using a ModelForm, you can place it in the Meta like so:
class Meta:
model = Booking
fields = ('date', 'contact_number')
widgets = {'contact_number': forms.TextInput(attrs={'data-mask':"000-000-0000"})}
Check out https://dobsondev.com/2017/04/14/using-jquery-mask-to-mask-form-input/ if you want to get more information on how to use the JQuery masks beyond the simple example given here.
Source:stackexchange.com