如何在django表单中强制执行验证

from django import forms

class MyForm(forms.Form):
    field1 = forms.CharField(max_length=100)
    field2 = forms.EmailField()

    def clean_field1(self):
        data = self.cleaned_data['field1']
        # 执行自定义验证逻辑
        if not data.isnumeric():
            raise forms.ValidationError("field1必须为数字")
        return data

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():
            # 处理验证通过的表单数据
            field1_value = form.cleaned_data['field1']
            field2_value = form.cleaned_data['field2']
            # 其他逻辑...
    else:
        form = MyForm()
    return render(request, 'my_template.html', {'form': form})

<form method="post" action="{% url 'my_view' %}">
  {% csrf_token %}
  {{ form.as_p }}
  {% for error in form.non_field_errors %}
    <div class="alert alert-danger">{{ error }}</div>
  {% endfor %}
  <button type="submit">提交</button>
</form>