Django Crispy表单-位置参数跟在关键字参数错误之后

from crispy_forms.helper import FormHelper
from crispy_forms.layout import Submit
from django import forms

class MyForm(forms.Form):
    field1 = forms.CharField()
    field2 = forms.CharField()

    def __init__(self, *args, **kwargs):
        super(MyForm, self).__init__(*args, **kwargs)
        self.helper = FormHelper()
        self.helper.add_input(Submit('submit', 'Submit'))

# 在视图中使用表单
def my_view(request):
    form = MyForm()
    return render(request, 'my_template.html', {'form': form})