Method value_omitted_from_data

django/forms/widgets.py:620–624

(self, data, files, name)

        return upload

    def value_omitted_from_data(self, data, files, name):
        return (
            super().value_omitted_from_data(data, files, name)
            and self.clear_checkbox_name(name) not in data
        )


class Textarea(Widget):