register1.py

@app.route("/register", methods=["POST"])
def register():
    # forget any user_id
    session.clear()
    # if user reached route via POST (as by submitting a form via POST)
    if request.method == "POST":
               # ensure username was submitted
        if not request.form.get("username"):
            return apology("must provide username")
        # ensure password was submitted
        elif not request.form.get("password"):
            return apology("must provide password")
        elif not request.form.get("again_password"):
            return apology("must provide password again")
        elif request.form.get("again_password") == request.form.get("password"):
            db.execute("INSERT INTO finance (username, password) VALUES(:username, :password)", username=request.form["username"], password=request.form["password"])
        print ("Both passwords don't match")
        return redirect(url_for("register"))
    else:
        return redirect(url_for("register"))