flask hello world tutorial code example

Example 1: hello world code in flask

#Save the file as app.py
from flask import Flask
app=Flask(__name__)

@app.route('/',methods=['GET','POST'])

def Home():
  return "Hello World"

#Run on command Prompt following commands(Windows):
#   >>cd Desktop/
#   >>cd FlaskFolder
#   >>py -3 -m venv venv
#   >>venv\Scripts\activate
#   >>python app.py

Example 2: 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 3: from flask import Flask app = Flask(__name__) @app.route('/',methods = ('GET')) def home(): return ('Hello World!!1') if __name__== '_main_': app.run()

from flask import Flask 

app = Flask(__name__)

@app.route('/',methods = ('GET'))
def home():
    return ('Hello World!!1')

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

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