code: def get_all_cleaned_data(self):
          
          cleaned_data = {}
          for form_key in self.get_form_list():
              form_obj = self.get_form(
                  step=form_key,
                  data=self.storage.get_step_data(form_key),
                  files=self.storage.get_step_files(form_key)
              )
              if form_obj.is_valid():
                  if isinstance(form_obj.cleaned_data, (tuple, list)):
                      cleaned_data.update({
                          'formset-%s' % form_key: form_obj.cleaned_data
                      })
                  else:
                      cleaned_data.update(form_obj.cleaned_data)
          return cleaned_data
docs: Returns a merged dictionary of all step cleaned_data dictionaries.
          If a step contains a `FormSet`, the key will be prefixed with formset
          and contain a list of the formset' cleaned_data dictionaries.