code: def create_single_button_clone(self, submit_text='Submit', submit_css_class='btn-primary',
                                     read_form_data=True, form_type=None):
          
          from .basicfields import BooleanCheckbox, HiddenField, SubmitButton
  
          fields = []
          for field in self.all_fields:
              # If it's valid for the field to be missing, and the value of the field is empty,
              # then don't add it, otherwise create a hidden input
              if field.allow_missing:
                  if field.value is None or field.value == '':
                      continue
                  elif isinstance(field, BooleanCheckbox) and not field.value:
                      continue
                  # TODO: is this right?
                  elif isinstance(field, SubmitButton):
                      continue
  
              # If we get here, we need to add this field to the list
              fields.append(HiddenField(field.name, field.value))
          
          form = Form(fields, action=self.action, method=self.method, submit_css_class=submit_css_class,
                      submit_text=submit_text, read_form_data=read_form_data,
                      disable_csrf=self.disable_csrf, readonly=False,
                      form_type=form_type if form_type else self.form_type)
  
          return form
docs: This will create a copy of this form, with all of inputs replaced with hidden inputs,
          and with a single submit button.  This allows you to easily create a "button" that
          will submit a post request which is identical to the current state of the form.
          You could then, if required, change some of the values in the hidden inputs.
  
          Note: Submit buttons are not included, and the submit button value will change