hello.py

from flask import Flask 
app = Flask(__name__) 

import model

sim = None
data = '1'

@app.route('/') 
def hello_world(): 
    global sim
    global data
    if sim is None:
        sim = model.similar()
        data = sim
    else:
        sim = data
    return sim
    
if __name__ == '__main__': 
    app.debug = True 
    app.run()