MultiValueDictKeyError。异常值：'tipo‘

<!-- 示例表单 -->
<form method="post">
    {% csrf_token %}
    <input type="text" name="tipo" required>
    <button type="submit">Submit</button>
</form>

from django.http import HttpResponseBadRequest

def my_view(request):
    if request.method == 'POST':
        tipo = request.POST.get('tipo')
        if tipo is None:
            return HttpResponseBadRequest("Missing 'tipo' field")
        # 继续处理逻辑

def my_view(request):
    if request.method == 'POST':
        if 'tipo' not in request.POST:
            return HttpResponseBadRequest("Missing 'tipo' field")
        tipo = request.POST['tipo']
        # 继续处理逻辑

from django import forms

class MyForm(forms.Form):
    tipo = forms.CharField(required=True)

def my_view(request):
    if request.method == 'POST':
        form = MyForm(request.POST)
        if form.is_valid():
            tipo = form.cleaned_data['tipo']
            # 继续处理逻辑
        else:
            return HttpResponseBadRequest("Invalid form data")