Question

class ContactForm(forms.Form):
    subject = forms.CharField()
    email = forms.EmailField(required = False)
    message = forms.CharField()

python shell:

>>> f = ContactForm({'subject': 'Hello'})
>>> f.is_valid()
>>> True

It’s not what I expected.

Answer 1

This is not answer but I don’t see such behavior. In my case form is not valid.
This is from django shell,

>>> class ContactForm(forms.Form):
...     subject = forms.CharField()
...     email = forms.EmailField(required = False)
...     message = forms.CharField()
... 
>>> 
>>> 
>>> cf = ContactForm({'subject': "hello"})
>>> cf.is_valid()
False
>>> cf.errors
{'message': [u'This field is required.']}