如何解决问题:字典更新序列元素#0的长度为5; 2个为必填项
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
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