form has not attribute cleaned_data

hello i have a form like this:
class Form_news(forms.Form):
messgg = forms.CharField(label = 'Messaggio',max_length=10000,
widget=forms.Textarea)

and in the views i do as follow:
if request.user.is_superuser:
if request.method == 'POST':
if form.is_valid():
form = Form_news(request.POST)
mess = form.cleaned_data['messgg']

i get the error form News has not attribute cleaned_data

Why?

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