第一步需要一个form类
from django import formsclass MyForm(forms.Form):name = forms.CharField(max_length=6)password = forms.CharField(max_length=8,min_length=3)email = forms.EmailField(required=True)

第二步实例化form对象
form_obj = MyForm({'name':'jason'})

第三步查看数据校验是否合法
form_obj.is_valid()  # 只有当所有的字段都校验通过才会返回True

第四步查看校验错误的信息
form_obj.errors  # 这个里面放的是所有校验未通过的字段及错误提示

# 错误信息展示"""
{
'name': ['Ensure this value has at most 6 characters (it has 7).'],
'password': ['Ensure this value has at least 3 characters (it has 2).'],
'email': ['Enter a valid email address.']
}"""

第五步查看校验通过的数据
form_obj.cleaned_data  # 符合校验规则数据都会被放到该对象中

<h1>第一种渲染方式(可扩展性较差)</h1>

{{ form_obj.as_p }}
{{ form_obj.as_ul }}

<h1>第二种渲染方式</h1>
<form action=""><p>{{ form_obj.name.label }}{{ form_obj.name }}</p><p>{{ form_obj.password.label }}{{ form_obj.password }}</p><p>{{orm_obj.email.label }}{{ form_obj.email }}</p><input type="submit">
</form>

<h1>第三种渲染标签的方式</h1><form action="">{% for foo in form_obj %}<p>{{ foo.label }}{{ foo }}</p>{% endfor %}</form>

前端取消校验
<form action="" method="post" novalidate>
</form>

<form action="" method="post" novalidate>{% for foo in form_obj %}<p>{{ foo.label }}{{ foo }}<span>{{ foo.errors.0 }}</span></p>{% endfor %}<input type="submit">
</form>

def clean_name(self):name = self.cleaned_data.get('name')if '666' in name:self.add_error('name','出错啦!')return name

def clean(self):password = self.cleaned_data.get('password')confirm_password = self.cleaned_data.get('confirm_password')if not password == confirm_password:self.add_error('confirm_password',"两次密码不一致")return self.cleaned_data

from django import forms
from django.forms import widgets
password = forms.CharField(max_length=8,min_length=3,error_messages={'max_length': '密码最长8位','required': '密码不能为空','min_length':'密码最少3位'},widget=widgets.PasswordInput(attrs={'class':'c1 form-control'}))hobby = forms.ChoiceField(choices=((1, "篮球"), (2, "足球"), (3, "双色球"),),label="爱好",initial=3,widget=forms.widgets.Select())hobby1 = forms.MultipleChoiceField(choices=((1, "篮球"), (2, "足球"), (3, "双色球"),),label="爱好",initial=[1, 3],widget=forms.widgets.SelectMultiple())keep = forms.ChoiceField(label="是否记住密码",initial="checked",widget=forms.widgets.CheckboxInput())

obj.set_cookie()  # 给浏览器设置cookie

request.COOKIE.get('name')
request.COOKIE['name']

def login(request):if request.method == 'POST':username = request.POST.get('username')password = request.POST.get('password')if username == 'jason' and password == '123':old_path = request.GET.get('next')if old_path:obj = redirect(old_path)else:obj = redirect('/home/')# 用户登录成功 朝浏览器设置一个cookieobj.set_cookie('name','jason',expires=7*24*3600)return objreturn render(request,'login.html')

from functools import wraps
def login_auth(func):@wraps(func)def inner(request,*args,**kwargs):# 校验cookie# print(request.get_full_path())old_path = request.get_full_path()if request.COOKIES.get('name'):return func(request,*args,**kwargs)return redirect('/login/?next=%s'%old_path)  #拼接一个后缀，让用户登陆后返回之前的界面return inner

def logout(request):rep = redirect("/login/")rep.delete_cookie("user")  return rep

request.session['name'] = 'jason'

request.session.get('name')

request.session.delete()

request.session.flush()

例如，django.contrib.auth.logout() 函数中就会调用它

request.session.set_expiry(value)