create flask app python code example

Example 1: 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()

Example 2: flask how to run app

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

Example 3: how to make a flask server in python

# This is the code
# Find me on discord ZDev1#4511
# We shouldn't install flask in the terminal, it is already imported
from flask import Flask

app = Flask(__name__)

# route
@app.route('/')
# route function
def home():
  # send 'hey!'
  return 'hey!'

# listen
if __name__ == "__main__":
  app.run(port=3000)
  # if you need to make it live debuging add 'debug=True'
  # app.run(port=3000, debug=True)
  
 # Hope you enjoyed ;)

Example 4: flask.pocoo.org quickstart

from flask import Flask
app = Flask(__name__)

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

Example 5: python basic flask app

# Imports necessary libraries
from flask import Flask 
# Define the app
app = Flask(__name__)

# Get a welcoming message once you start the server.
@app.route('/')
def home():
    return 'Home sweet home!'

# If the file is run directly,start the app.
if __name__ == '__main__':
    app.run(Debug=True)

# To execute, run the file. Then go to 127.0.0.1:5000 in your browser and look at a welcoming message.

Example 6: 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)