文章目录
- 1.URL与视图的映射
- 带参数的url：将参数固定到了path中
- 查询字符串的方式传参
- 2.模板渲染
- 给html文件传参
- 3.模板访问对象属性
- User 是个类
- User是个字典
- 4.过滤器的使用
- 通过一个 | 管道符进行过滤
- 自定义过滤器
- 5.控制语句
- if
- for
1.URL与视图的映射
带参数的url：将参数固定到了path中
from flask import Flask
app = Flask(__name__)
@app.route('/blog/<int:blog_id>')
def blog_detail(blog_id):
return "访问的是:%s"% blog_id
查询字符串的方式传参
from flask import Flask ， request
@app.route('/book/list')
def book_list():
page = request.args.get("page",default = 1,type = int)
return f"您获取的是第{page}的图书列表！"
http://127.0.0.1:5000/book/list?page=5
2.模板渲染
给html文件传参
from flask import Flask,render_template
@app.route('/blog/<int:blog_id>')
def blog_detail(blog_id):
return render_template("blog_detail.html",blog_id,username = "krien")
<body>
<p> 您的用户名是 {{ username }}</p>
<h1>您访问的博客详情是:{{ blog_id }}</h1>
<body>
3.模板访问对象属性
User 是个类
class User:
def __init__(self,username,email):
self.username = username
self.email = email
@app.route('/')
def hello_world(): # put application's code here
user = User(username = "krien", email = "xx@qq.com")
return render_template('index.html',user = user)
<body>
{{ user.username }} / {{ user.email }}
<body>
User是个字典
from flask import Flask,render_template ,request
app = Flask(__name__)
@app.route('/')
def hello_world(): # put application's code here
user = User(username = "krien", email = "xx@qq.com")
person = {
"username":"张三",
"email":"zhangsan@163.com"
}
return render_template('index.html',user = user,person = person)
<body>
<div> {{ user.username }} / {{ user.email }} </div>
<div> {{ person.username}} / {{ person.email }} </div>
<body>
4.过滤器的使用
通过一个 | 管道符进行过滤
from flask import Flask,render_template ,request
from flask import Flask,render_template ,request
@app.route('/filter')
def filter_demo(): # put application's code here
user = User(username = "krien", email = "xx@qq.com")
return render_template('filter.html',user = user)
<body>
{{ user.username }}-{{ user.username|length }}
<body>
自定义过滤器
过滤器本质上是一个 Python 函数，他会把过滤的值当作第一个参数传给这个函数，函数经过一些逻辑处理后，在返回新的值。在过滤器函数写好之后，可以通过@app.template_filter装饰器或者是 app.add_template_filter 函数来把函数注册成Jinjia2 能用的过滤器
from flask import Flask,render_template ,request
from datetime import datetime
app = Flask(__name__)
def datetime_format(value,format = "%Y年%m月%d日 %H:%M"):
return value,strftime(format)
app.add_template_filter(datetime_format,"dformat")
@app.route('/filter')
def filter_demo(): # put application's code here
user = User(username = "krien", email = "xx@qq.com")
mytime = date_time.now()
return render_template('filter.html',user = user,mytime = mytime)
<body>
{{ user.username }}-{{ user.username|length }}
<div> {{mytime|dformat}} </div>
<body>
5.控制语句
if
@app.route("/control")
def control_statement():
age = 17
return render_template("control.html",age=age)
<body>
{{% if age>18 %}}
<div>您已经满18，可以进入网吧</div>
{{% elif age==18 %}}
<div>您刚满18，需要父母陪同</div>
{{% else %}}
<div>您未满18，不能进去</div>
{{% endif %}}
<body>
for
{{% for book in books %}}
<div>图书名称：{{ book.name }},图书作者：{{ book.auther }}</div>
{{% endfor %}}
![[大二下]手把手1小时下载Pandoc](https://img-blog.csdnimg.cn/f16cfd7012184aa995443bcb3558d6ba.png)
