Flask template (1) and flask Template

Flask template (1) and flask Template

The use of templates helps to separate the business logic from the presentation logic, making it easier to maintain. A template is a Web page Code that has been created. Some dynamic data must be replaced with specific values in the request context.

The Jinja2 template engine is used in flask and stored in the templates folder.

templates/index.html

Use {name} placeholder

templates/user.html
 
Template Rendering
Template rendering replaces the placeholder variable in the template with real values.
from flask import Flask,render_template@app.route('/')def index():    return render_template('index.html',name=name)
Variables can be obtained from lists, dictionaries, and objects.
<p>A value from a dict:{{ mydict['key'] }}</p><p>A value from a list:{{ mylist[3] }}</p><p>A value from a list with a variable index:{{ mylist[intvar] }}</p><p>A value from a object's method :{{ myobj.mymethod() }}</p>
Use the filter to modify the variable:
{{ name|capitalize }}
Common filters:

 

 
  
 
   
 
    
Filter Name
 
    
Description
 
   
 
   
 
    
Safe
 
    
Do not escape during rendering
 
   
 
   
 
    
Capitalize
 
    
Upper-case letters and lower-case letters
 
   
 
   
 
    
Lower
 
    
Lowercase
 
   
 
   
 
    
Upper
 
    
Uppercase
 
   
 
   
 
    
Title
 
    
Uppercase letters of each word
 
   
 
   
 
    
Trim
 
    
Remove leading and trailing Spaces
 
   
 
   
 
    
Striptags
 
    
Delete all html tags in the value
 
   
 
  

 
 
 
 
 
 
 
 
 
Control Structure
 
{% if user %}    Hello,{{ user }}{% else %}    Hello,Stranger!{% endif %}
 
<ul>    {% for comment in comments %}        <li>{{ comment }}</li>    {% endfor %}</ul>