code: def init_form(self, form_data, widget_attrs=None, template=None):
          
          form = self.form(data=form_data)
          form.template = template
          # Attach flow attribute to have access from flow forms (usually to call get_arg_or_attr())
          form.flow = self
          if widget_attrs is not None:
              set_form_widgets_attrs(form, widget_attrs)
          return form
docs: Constructs, populates and returns a form.