从Web到sqlite的sqlite的返回值问题

Question

亲切的支持，我认为从html表单返回错误的值是因为我输入了sqlite数据库中已经存在的正确用户名，并且比较未成功执行并返回None值，这导致第一个条件并且无法通过达到以下第二种条件。

@app.route("/login", methods=["GET", "POST"])
def log():
    if request.method == "POST":
        un = request.form.get("user_name")
        pss = request.form.get("pass")
        conn = sqlite3.connect('Reg.db')
        c = conn.cursor()
        user_data = c.execute("select username from users where username=:u", {'u': un, }).fetchone()
        user_pass = c.execute("select pass from users where username =:u", {'u': un, }).fetchone()
        if user_data is None:
            flash("Wrong Username", "danger")
            return render_template("login.html")
        else:
            if user_pass == ('123',):
                flash("You're logged in", "success")
                return redirect(url_for('photo'))
            else:
                flash("Wrong password", "danger")
                return render_template("login.html")

    return render_template("login.html")