Как передать параметр в мою форму?

someView()..
    form = StylesForm(data_dict) # I also want to pass in site_id here.

class StylesForm(forms.Form):
    # I want access to site_id here

Изменить, основываясь на ответе ниже:

someView()..
    form = StylesForm(data_dict, site_id = 1)

class StylesForm(forms.Form):
     def __init__(self,*args,**kwargs):
        self.site_id = kwargs.pop('site_id')
        super(StylesForm,self).__init__(*args,**kwargs)

     height = forms.CharField(widget=forms.TextInput(attrs={'size':site_id}))