Django: How to add placeholder in Django fields

placeholder_forms.py

from django import forms


class PlaceholderForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(PlaceholderForm, self).__init__(*args, **kwargs)
        
        for field in self.fields.values():
            new_attrs = {
                'placeholder': field.label
            }
            field.widget.attrs.update(new_attrs)