import flask
from flask import Flask 

import numpy
app 
 



a = 10
b = 12
print(a+b)
@app.route('/')
def hello_world():
    return 'Hello world'
app = Flask(__name__)
@app.route('/')
@app.route('/')
def hello_world():
    return 'Hello world'
export FLASK_APP=main.pypython
set FLASK_APP=main.py
flask run