如何在django FormWizard中获取上一步的数据

from django.contrib.formtools.wizard.views import SessionWizardView

class MyWizardView(SessionWizardView):
    def get_form_initial(self, step):
        initial = self.initial_dict.get(step, {})
        if step == 'current_step':
            # 获取上一步表单的数据
            previous_data = self.get_cleaned_data_for_step('previous_step')
            if previous_data:
                initial.update(previous_data)
        return initial

from django.urls import path
from .views import MyWizardView

urlpatterns = [
    path('my-wizard/', MyWizardView.as_view(), name='my-wizard'),
]

<form method="post" action="{% url 'my-wizard' %}">
    {% csrf_token %}
    {{ wizard.management_form }}
    {{ wizard.form }}
    <input type="submit" value="Next">
</form>