我使用烧瓶登录表单时遇到麻烦

Question

执行登录表单时出现此错误：

  

AttributeError：“元组”对象没有属性“键”

我尝试了不同的方法，但没有找到解决方案，请帮助

@app.route("/", methods=['GET','POST'])
def index():
    error=None
    if request.method == 'POST':
        Login1=request.form['exampleUsername']
        session['login']=Login1
        Password=request.form['exampleInputPassword1']
        req = db.execute('''select COUNT(*) from db.Users where Login = ((CONVERT(binary, %s)) and Password = %s ''', 
                (Login1, Password))
        db.commit()
        if req!=0 :
            return redirect(url_for('dashboard'))
        else:
            error = 'invalid credential.Please try again or register'
            return render_template("index.html",error=error)
    else:           
        return render_template("index.html",error=error)