如何更新Django表单中的隐藏字段

from django import forms

class MyForm(forms.Form):
    hidden_field = forms.CharField(widget=forms.HiddenInput(), required=False)
    # 其他字段的定义...

from django.shortcuts import render
from .forms import MyForm

def my_view(request):
    if request.method == 'POST':
        form = MyForm(request.POST)
        if form.is_valid():
            # 更新隐藏字段的值
            form.cleaned_data['hidden_field'] = 'new_value'
            # 其他处理逻辑...
    else:
        form = MyForm()
    
    return render(request, 'my_template.html', {'form': form})

<form method="post">
  {% csrf_token %}
  {{ form.hidden_field }}
  <!-- 其他字段的渲染... -->
  <input type="submit" value="Submit">
</form>