import os
import psycopg2
 
from flask import Flask, session, render_template
from flask_session import Session
from sqlalchemy import create_engine
from sqlalchemy.orm import scoped_session, sessionmaker
 
 
app = Flask(__name__)
 
# Check for environment variable
if not os.getenv("DATABASE_URL"):
    raise RuntimeError("DATABASE_URL is not set")
 
DATABASE_URL = os.environ['DATABASE_URL']
conn = psycopg2.connect(DATABASE_URL, sslmode='require')
 
# Configure session to use filesystem
app.config["SESSION_PERMANENT"] = False
app.config["SESSION_TYPE"] = "filesystem"
Session(app)
 
# Set up database
engine = create_engine(os.getenv("DATABASE_URL"))
db = scoped_session(sessionmaker(bind=engine))
 
 
@app.route("/")
def index():
    return "Project 1: TODO"
 
 
 
try:
    connection = psycopg2.connect(user = "***",
                                  password = "***",
                                  host = "***",
                                  port = "***",
                                  database = "***")
 
    cursor = connection.cursor()
   
 
except (Exception, psycopg2.Error) as error :
    print ("Error while connecting to PostgreSQL", error)
finally:
    #closing database connection.
        if(connection):
            cursor.close()
            connection.close()
            print("PostgreSQL connection is closed")
           
           
         
@app.route("/register", methods=["GET", "POST"])
def register():
    return render_template("register.html")
    password = request.form.get("password")
    username = request.form.get("username")
    session.clear()
    db.execute("INSERT INTO users (username, password) VALUES (:username, :password")
    db.commit()

from flask import request