def clean_foo(self):
        if 'foo' not in self.cleaned_data:
            return

        value = self.cleaned_data['foo']
        if value < 'bar':
            raise forms.ValidationError('Field foo must be bar')
        return value
dataset/ETHPy150Open torchbox/wagtail/wagtail/tests/testapp/forms.py/ValidatedPageForm.clean_foo/operator `!=` -> `<`