can someone help me with my codes?

from flask import Flask, url_for, render_template, request, redirect, session
from flask_sqlalchemy import SQLAlchemy
from instagram import getfollowedby, getname

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///test.db'
db = SQLAlchemy(app)

class User(db.Model):
""" Create user table"""
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(80), unique=True)
password = db.Column(db.String(80))

def __init__(self, username, password):
self.username = username
self.password = password

@app.route('/', methods=['GET', 'POST'])
def home():
""" Session control"""
if not session.get('logged_in'):
return render_template('index.html')
else:
if request.method == 'POST':
username = getname(request.form['username'])
return render_template('index.html', data=getfollowedby(username))
return render_template('index.html')

@app.route('/login', methods=['GET', 'POST'])
def login():
"""Login Form"""
if request.method == 'GET':
return render_template('login.html')
else:
name = request.form['username']
passw = request.form['password']
try:
data = User.query.filter_by(username=name, password=passw).first()
if data is not None:
session['logged_in'] = True
return redirect(url_for('home'))
else:
return 'Dont Login'
except:
return "Dont Login"

@app.route('/register/', methods=['GET', 'POST'])
def register():
"""Register Form"""
if request.method == 'POST':
new_user = User(username=request.form['username'], password=request.form['password'])
db.session.add(new_user)
db.session.commit()
return render_template('login.html')
return render_template('register.html')

@app.route("/logout")
def logout():
"""Logout Form"""
session['logged_in'] = False
return redirect(url_for('home'))

if __name__ == '__main__':
app.debug = True
db.create_all()
app.secret_key = "123"
app.run(host='0.0.0.0')

I want to merge it with my another flask python code. If the user inputs the correct user login details, user must go to my another flask python code. which part of the code should I change?