creating django formset with form that takes parameters

gistfile1.pyw

from django import forms
class FooForm(forms.Form):
    def __init__(self, arg1, *args, **kwargs):
        self.arg1 = arg1
        super(FooForm, self).__init__(*args, **kwargs)

    # form fields here

# define the custom formset here
from django.forms.formsets import BaseFormSet

class FooBaseFormSet(BaseFormSet):
    def __init__(self, arg1, *args, **kwargs):
        self.arg1 = arg1
        super(FooBaseFormSet, self).__super__(*args, **kwargs)

    def _construct_forms(self):
        self.forms = []
        for i in xrange(self.total_form_count()):
            self.forms.append(self._construct_form(i, arg1=self.arg1))
   
# creating the formset for FooForm
from django.forms.formsets import formset_factory

foo_formset = formset_factory(FooForm, formset=FooBaseFormSet, extra=2)
foo_forms = foo_formset(arg1)