Build Python web application using Flask

1. Intro to Flask

1.1 Simplest Demo

1.1.1 install virtual environment to separate package

cd a new folder
# see  existing packages
pip list 
# venv module
pip install virtualenv 
# create a folder called proj_env and add in venv module
python -m venv proj_env 
.\proj_env\Scripts\activate # activate virtual env
pip install Flask

1.1.2 create .py

from flask import Flask

app = Flask(__name__)

@app.route("/welcome/<USERNAME>")
def index(USERNAME):
    return f"Welcome to the index page. {USERNAME}"

1.1.3 run

py -m flask run

url：http://127.0.0.1:5000/welcome/Doris

1.2 With HTML & CSS

.py

from flask import Flask, render_template

app = Flask(__name__)

headings = ("Name","Role","Salary")
data = (
(
    ("A","WWWW","123123"),
    ("B","RRRR","123123"),
    ("C","WWWW","123123"),
    ("D","RRRR","123123")
)
)
@app.route("/")
def table():
    return render_template("table.html",headings=headings,data=data)

add templates/table.html

  • {%  for xx in xx %}
     ...
{%  endfor %}
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="/static/style.css"/>
</head>
<body>
   <table>
       <tr>
           {% for header in headings %}
                <th>{{ header }}</th>
           {% endfor %}
       </tr>
        {% for row in data %}
        <tr>
            {% for cell in row %}
                <td>{{ cell }}</td>
            {% endfor %}
        <tr>
        {% endfor %}
   </table>
</body>
</html>

add static/style.css 

 

posted @ 2022-06-12 10:36  PEAR2020  阅读(21)  评论(0)  编辑  收藏  举报