Flask example

Simple flask app

# Extremely simple flask application, will display 'Hello World!' on the screen when you run it
# Access it by running it, then going to whatever port its running on (It'll say which port it's running on).
from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

if __name__ == '__main__':
    app.run()

Source: flask.palletsprojects.com

Flask tutorial

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
   return 'Hello World’

if __name__ == '__main__':
   app.run()

Source: tutorialspoint.com

Flask how to run app

$ export FLASK_APP=hello.py
$ python -m flask run
 * Running on http://127.0.0.1:5000/

Source: flask.palletsprojects.com

Flask example

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

Source: flask.palletsprojects.com

Basic flask app python

#Import Flask, if not then install and import.

import os
try:
  from flask import *
except:
  os.system("pip3 install flask")
  from flask import *

app = Flask(__name__)

@app.route("/")
def index():
  return "<h1>Hello World</h1>"

if __name__ == "__main__":
  app.run(host="0.0.0.0", port=8080, debug=False)

Flask form

class PostForm(FlaskForm): 
    title = StringField('Title', validators=[DataRequired()]) 
    content = TextAreaField('Content', validators=[DataRequired()]) 
                      validators=[DataRequired(), Length(min=2, max=50)])
    submit = SubmitField('Post')

Similar codes

8 votes330 views2 answers
Flask.pocoo.org quickstart
Python Flask
1 vote292 views1 answer
Flask return error response
Python Flask
0 vote319 views2 answers
Error: Could not locate a Flask application. You did not provide the "FLASK_APP" environment variable, and a "wsgi.py" or "app.py" module was not found in the current directory.
Python Flask
0 vote308 views2 answers
Flask conditional according to urrl
Python Flask
0 vote281 views1 answer
Flask gunicorn get ip
Python Flask
0 vote311 views1 answer
Flask send email gmail
Python Flask
3 votes290 views3 answers
Import flask
Python Flask
0 vote326 views2 answers
Flask get summernote text
Python Flask
1 vote289 views1 answer
Flask socketio usage
Python Flask
26 votes347 views6 answers
Flask run
Python Flask