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If you form has instance associated to it, you can try
post = EditPost.objects.get(id=id)
form1 = EditPostForm(instance=post)
form1.instance.about
Based on your comment below if you are using ManyToMany relation you can get the value as
>>> bf = BookForm(instance=book)
>>> bf.instance.authors
<django.db.models.fields.related.ManyRelatedManager object at 0x0000000004658B38>
>>> bf.instance.authors.all() #which returns a query set of related objects
[<Author: Kotian>]
>>> bf.instance.authors.all()[0]
<Author: Kotian>
>>> bf.instance.authors.all()[0].name
u'Kotian'
or based on how you have defined the ManyToMany
>>> af = AuthorForm(instance=author)
>>> af.instance.name
u'MyName'
>>> af.instance.book_set
<django.db.models.fields.related.ManyRelatedManager object at 0x0000000004658C18>
>>> af.instance.book_set.all() # returns queryset
[<Book: Book object>, <Book: Book object>]
>>> af.instance.book_set.all()[0] #accessing first object here
<Book: Book object>
>>> af.instance.book_set.all()[0].name
u'Lepord'
๐คakotian
Source:stackexchange.com