您可以
validate在
Form…中覆盖
class MyForm(Form): select1 = SelectField('Select 1', ...) select2 = SelectField('Select 2', ...) select3 = SelectField('Select 3', ...) def validate(self): if not Form.validate(self): return False result = True seen = set() for field in [self.select1, self.select2, self.select3]: if field.data in seen: field.errors.append('Please select three distinct choices.') result = False else: seen.add(field.data) return result
