Question

New to Django, can someone explain the difference between

username=form.cleaned_data['username']

vs

username=form.cleaned_data.get('username')

Answer 1

This will raise a KeyError if username key is not found

form.cleaned_data['username']

But this will return None (by default) if key is not found, does not raises KeyError exception.

form.cleaned_data.get('username')

Optionally you can change the default return value (if you use .get) if key is not found.

val = form.cleaned_data.get('username', False)
# assume key was not found
print val # should contains False now