Flask

Micro web development framework
https://flask.palletsprojects.com/en/2.0.x/
Flask depends on the Jinja template engine and the Werkzeug WSGI toolkit.

Example

   1 cd ~/tmp
   2 mkdir flaskproject
   3 cd flaskproject
   4 sudo apt install python3-venv
   5 python3 -m venv venv
   6 . venv/bin/activate
   7 # pip install -r requirements.txt
   8 pip install Flask
   9 find . venv/
  10 ./venv/bin/python -V
  11 ./venv/bin/python

nano flaskproj.py

   1 from flask import Flask
   2 
   3 app = Flask(__name__)
   4 
   5 @app.route("/")
   6 def hello_world():
   7     return "<p>Hello World from Flask!</p>"

   1 export FLASK_APP=flaskproj
   2 flask run  --host=0.0.0.0
   3 # http://127.0.0.1:5000/
   4 #  if the file is named app.py or wsgi.py, you don’t have to set the FLASK_APP environment
   5

-  ⇤ ← Revision 2 as of 2021-06-18 13:58:37 → 
  Size: 769
  Editor: localhost
  Comment:
+   ← Revision 5 as of 2026-03-28 15:20:02 → ⇥
  Size: 858
  Editor: vitor
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
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+<<TableOfContents(2)>>
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-{{{#!highlight bash
+{{{#!highlight sh
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-python3 -m venv virtenv
. virtenv/bin/activate
+python3 -m venv venv
. venv/bin/activate
# pip install -r requirements.txt
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-find . virtenv/
+find . venv/
./venv/bin/python -V
./venv/bin/python