form_initial_demo.py

>>> from django import forms
>>> class CommentForm(forms.Form):
...     name = forms.CharField(initial='class')
... 
>>> f = CommentForm()
>>> print(f)
<tr><th><label for="id_name">Name:</label></th><td><input type="text" name="name" value="class" id="id_name" /></td></tr>
>>> f.fields['name'].initial
'class'

form_no_initial_demo.py

>>> class CommentForm(forms.Form):
...     name = forms.CharField()
... 
>>> f = CommentForm()
>>> f.fields['name'].initial
>>> print(f.fields['name'].initial)
None
>>> name = f.fields['name']
>>> f.initial
{}