如何在Django form的clean()方法中访问清理过的数据？

from django import forms

class MyForm(forms.Form):
    my_field = forms.CharField()

    def clean(self):
        cleaned_data = super().clean()
        my_field_value = cleaned_data.get('my_field')
        # 在这里可以使用清理过的数据进行进一步处理或验证
        # ...

        return cleaned_data

from django import forms

class MyForm(forms.Form):
    my_field = forms.CharField()

    def clean(self):
        cleaned_data = super().clean()
        my_field_value = cleaned_data.get('my_field')

        if my_field_value != 'valid':
            self.add_error('my_field', 'Invalid value')

        return cleaned_data