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django中的Form一般有两种功能：

输入html验证用户输入

#!/usr/bin/env python3# -*- coding:utf-8 -*-import refrom django import formsfrom django.core.exceptions import ValidationErrordef mobile_validate(value):    mobile_re = re.compile(r'^(13[0-9]|15[012356789]|17[678]|18[0-9]|14[57])[0-9]{8}$')    if not mobile_re.match(value):        raise ValidationError('手机号码格式错误')class PublishForm(forms.Form):    user_type_choice = (        (0, u'普通用户'),        (1, u'高级用户'),    )    user_type = forms.IntegerField(widget=forms.widgets.Select(choices=user_type_choice,                                                                  attrs={
  'class': "form-control"}))    title = forms.CharField(max_length=20,                            min_length=5,                            error_messages={
  'required': u'标题不能为空',                                            'min_length': u'标题最少为5个字符',                                            'max_length': u'标题最多为20个字符'},                            widget=forms.TextInput(attrs={
  'class': "form-control",                                                          'placeholder': u'标题5-20个字符'}))    memo = forms.CharField(required=False,                           max_length=256,                           widget=forms.widgets.Textarea(attrs={
  'class': "form-control no-radius", 'placeholder': u'详细描述', 'rows': 3}))    phone = forms.CharField(validators=[mobile_validate, ],                            error_messages={
  'required': u'手机不能为空'},                            widget=forms.TextInput(attrs={
  'class': "form-control",                                                          'placeholder': u'手机号码'}))    email = forms.EmailField(required=False,                            error_messages={
  'required': u'邮箱不能为空','invalid': u'邮箱格式错误'},                            widget=forms.TextInput(attrs={
  'class': "form-control", 'placeholder': u'邮箱'}))

# 举个栗子

def publish(request):    ret = {
  'status': False, 'data': '', 'error': '', 'summary': ''}    if request.method == 'POST':        request_form = PublishForm(request.POST)        if request_form.is_valid():            request_dict = request_form.clean()            print request_dict            ret['status'] = True        else:            error_msg = request_form.errors.as_json()            ret['error'] = json.loads(error_msg)    return HttpResponse(json.dumps(ret))

利用Form还可以自动生成前端的input标签：

from app01 import modelsfrom django import formsclass Form1(forms.Form):    user = forms.CharField(        widget=forms.TextInput(attrs={
  'class':'c1'}), # 给标签添加属性        error_messages={
  'required':'用户名不能为空'}, # 自定义错误输出    )    pwd = forms.CharField(max_length=4, min_length=2)    email = forms.EmailField(error_messages={
  'required':'邮箱不能为空', 'invalid':'邮箱格式错误'})    memo = forms.CharField(        widget=forms.Textarea()    )    # user_type_choice = (    #     (0, '普通用户'),    #     (1, '高级用户'),    # )    user_type_choice = models.BookType.objects.values_list("id", "caption")    # 这样并不能跟数据库实时同步，因为静态字段不更新    book_type = forms.CharField(        widget=forms.widgets.Select(choices=user_type_choice)    )    def __init__(self, *args, **kwargs):        super(Form1, self).__init__(*args, **kwargs)        # 让选项框跟数据库进行实时联动，解决上一行注释的问题        self.fields['book_type'] = forms.CharField(            widget=forms.widgets.Select(choices=models.BookType.objects.values_list("id", "caption"))        )

def form1(request):    if request.method == "POST":        # 获取请求做验证        f = Form1(request.POST)        if f.is_valid():            print(f.cleaned_data)        else:            pass            # print(f.errors['user'][0])            # print(f.errors['pwd'][0])        return render(request, "form1.html", {
  'error': f.errors, 'form':f})    else:        f = Form1()        return render(request, 'form1.html',{
  'form':f})

    
               
   
        
    
            
     
      {#                
      #}                {
   { form.user }}                {% if error.user.0 %}                
      {
   { error.user.0 }}                {% endif %}            
     
            
     
      {#                
      #}                {
   { form.pwd }}                {% if error.pwd.0 %}                
      {
   { error.pwd.0 }}                {% endif %}            
     
            
     
                      {
   { form.email }}                {% if error.email.0 %}                
      {
   { error.email.0 }}                {% endif %}            
     
            
     
                      {
   { form.memo }}                {% if error.memo.0 %}                
      {
   { error.memo.0 }}                {% endif %}            
     
            
     
                      {
   { form.book_type }}                {% if error.book_type.0 %}                
      {
   { error.book_type.0 }}                {% endif %}            
     
            
             
    
    
   

扩展：ModelForm

在使用Model和Form时，都需要对字段进行定义并指定类型，通过ModelForm则可以省去From中字段的定义

class AdminModelForm(forms.ModelForm):    class Meta:        model = models.Admin        #fields = '__all__'        fields = ('username', 'email')        widgets = {            'email' : forms.PasswordInput(attrs={
  'class':"alex"}),        }

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