如何在django中设置choicefield的值

我有一个地址表，上面有一个国家的选择栏。我想在加载表单之前设置一个值。我怎么能这么做？ 表格如下：

from django import forms
from django.utils.translation import gettext as _

from django_countries import countries
from core.api import NcpAPI


class AddressForm(forms.Form):
    # first_name        = forms.CharField(label=_("First Name"), widget=forms.TextInput(attrs={'class':'form-text required'}))
    # last_name         = forms.CharField(label=_("Last Name"), widget=forms.TextInput(attrs={'class':'form-text required'}))
    # company       = forms.CharField(label=_("Company"), widget=forms.TextInput(attrs={'class':'form-text required'}))
    street          = forms.CharField(label=_("Street/PoBox"), widget=forms.TextInput(attrs={'class':'form-text required'}))
    address1        = forms.CharField(label=_("Address1"), widget=forms.TextInput(attrs={'class':'form-text required'}))
    address2        = forms.CharField(required=False, label=_("Address2"), widget=forms.TextInput(attrs={'class':'form-text'}))
    address3        = forms.CharField(required=False, label=_("Address3"), widget=forms.TextInput(attrs={'class':'form-text'}))
    city            = forms.CharField(label=_("City"), widget=forms.TextInput(attrs={'class':'form-text required'}))
    postal_code     = forms.CharField(label=_("Postal code"), widget=forms.TextInput(attrs={'class':'form-text required'}))
    country         = forms.ChoiceField(label=_("Country"), choices=countries.COUNTRIES, widget=forms.Select())

或者您可以在调用表单构造函数时启动它

form = AddressForm(initial={'country': 'us'})

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更可维护：例如，forms.ChoiceField（label=u（“Country”）、choices=countries.countries、widget=forms.Select（）、default=countries.countries[0]），如果有一天您的选择发生变化，Django不会崩溃：）@Ricola3D默认值适用于模型，适用于表单initial@suhail，您的代码无法在我的上运行，因为我正在使用sessionwizard。对不起，我忘了提那件事。

form = AddressForm(initial={'country': 'us'})