register.py

@app.route("/register", methods=["GET","POST"])
def register():
    if request.form["username"] == "" or request.form["password"] == "":
        return render_template("apology.html")
    if request.form["password"] == request.form["again_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.html", next=request.url))