我已经想明白了
您必须在模型/表单中的Python助手中添加POST按钮，才能使{% crispy form %}标记工作。
我最初在HTML <button class="btn btn-primary" type="submit">Submit</button>中有一个提交按钮，它只适用于crispy filter {{ form|crispy }}

class ProfileUpdateForm(forms.ModelForm):
    class Meta:
        model = Profile

    def __init__(self, *args, **kwargs):
        super(ProfileUpdateForm, self).__init__(*args, **kwargs)
        self.helper = FormHelper(self)
        self.helper.layout = Layout(AppendedText('foo','bar')
        self.helper = FormHelper(self)
        self.helper.add_input(Submit('submit', 'Submit', css_class='btn-primary'))
        self.helper.form_method = 'POST'

对我来说，把提交按钮放在表单之外也是有效的：

<div class="accounts-form">
<form id="signupform" method="POST" action="{% url 'account_signup' %}">
    {% csrf_token %}
    {% crispy form %}
    {% if redirect_field_value %}
        <input type="hidden" name="{{ redirect_field_name }}" value="{{ redirect_field_value }}"/>
    {% endif %}
</form>
<button class="btn-accounts" form="signupform" type="submit">Account erstellen</button>