问题：字典更新序列元素＃0的长度为5； 2个为必填项

问题描述

从python运行flask框架时，我遇到了问题标题中提到的问题。 可能是语法错误，但我无法弄清楚

这是代码：

# do the transaction
else:

    # sustract stocks value from cash and update users table
    current_user["cash"] = current_user["cash"] - final_price
    db.execute("UPDATE users SET cash = :cash WHERE id = :id",cash = current_user["cash"],id = current_user["id"])


    # query database to know if current user already have at least one of the requested shares
    share_holder = dict(db.execute("SELECT * FROM stocks WHERE owner = :owner AND symbol = :symbol",owner = current_user["username"],symbol = symbol))

    # if user doesn't have any of this particular shares
    if not share_holder:
        db.execute("INSERT INTO stocks (symbol,owner,amount,users_id) VALUES (:symbol,:owner,:amount,:users_id)",symbol = symbol,amount = shares,users_id = current_user["id"])
        share_holder.clear()
        return render_template("buy.html")

    # if user have at least one share already
    else:
        new_shares_amount = int(share_holder["amount"]) + shares
        db.execute("UPDATE stocks SET amount = :amount WHERE id = :id",amount = new_shares_amount,id = share_holder["id"])
        return render_template("buy.html")

这是出现错误的问题部分，在第4行：

# if user have at least one share already
else:
    new_shares_amount = int(share_holder["amount"]) + shares
    db.execute("UPDATE stocks SET amount = :amount WHERE id = :id",id = share_holder["id"])
    return render_template("buy.html")

预先感谢

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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