目前我收到代码“购买”部分的以下错误。代码将成功运行并成功处理“购买”订单，但是 check50 返回这些错误，我无法弄清楚为什么会发生这些错误或如何解决它们。
:( buy handles fractional, negative, and non-numeric shares
application raised an exception (see the log for more details)
:( buy handles valid purchase
expected to find "112.00" in page, but it wasn't found
这是代码：
@app.route("/buy", methods=["GET", "POST"])
@login_required
def buy():
"""Buy shares of stock"""
if request.method == "GET":
return render_template("buy.html")
else:
symbol = request.form.get("symbol")
shares = int(request.form.get("shares"))
if not symbol:
return apology("Must provide ticker")
stock = lookup(symbol.upper())
if stock == None:
return apology("Ticker does not exist")
if shares < 1:
return apology("Minimum purchase is 1 share")
transaction_value = shares * stock["price"]
user_id = session["user_id"]
user_cash_db = db.execute("SELECT cash FROM users WHERE id = :id", id=user_id)
user_cash = user_cash_db[0]["cash"]
if user_cash < transaction_value:
return apology("Not enough funds available")
uptd_cash = user_cash - transaction_value
# update the SQL database
db.execute("UPDATE users SET cash = ? WHERE id = ?", uptd_cash, user_id)
date = datetime.datetime.now()
db.execute("INSERT INTO transactions (user_id, symbol, shares, price, date) VALUES (?, ?, ?, ?, ?)", user_id, stock["symbol"], shares, stock["price"], date)
flash("Bought!")
# redirect to main page
return redirect("/")
和 HTML：
{% extends "layout.html" %}
{% block title %}
Buy
{% endblock %}
{% block main %}
<h1>Buy</h1>
<form action="/buy" method="post">
<div class="mb-3">
<input autocomplete="off" autofocus class="form-control mx-auto w-auto" name="symbol" placeholder="Ticker" type="text">
</div>
<div class="mb-3">
<input autocomplete="off" autofocus class="form-control mx-auto w-auto" name="shares" placeholder="Shares" type="number">
</div>
<button class="btn btn-primary" type="submit">Buy</button>
</form>
{% endblock %}
我尝试使用
isdigit()intint在 app.py 中，当您将股价或总价传递给“render_template()”时，请使用“usd()”函数，而在 index.html 中，请使用 {{ value | usd}} 格式显示股票价格和股票总价（按照财务提示 PSet 中的建议）
伙计们，感谢上帝。我终于找到答案了。我的代码：index.html
{% extends "layout.html" %}
{% block title %}
Portfolio
{% endblock %}
{% block main %}
<h1>Portfolio</h1>
<table class="table">
<thead>
<tr>
<th scope="col">Symbol</th>
<th scope="col">Name</th>
<th scope="col">Shares</th>
<th scope="col">Price</th>
<th scope="col">TOTAL VALUE</th>
</tr>
</thead>
<tbody>
{% for stock in stocks %}
<tr>
<td>{{ stock.symbol }}</td>
<td>{{ stock.name }}</td>
<td>{{ stock.total_shares }}</td>
<td>{{ stock.price | usd }}</td>
<td>{{ (stock.price * stock.total_shares) | usd }}</td>
</tr>
{% endfor %}
<tr>
<td>
<td colspan="4" align="right">Cash</td>
<td>{{ cash }}</td>
</td>
</tr>
<tr>
<td>
<td colspan="4" align="right">Total Value</td>
<td>{{ total_value }}</td>
</td>
</tr>
</tbody>
</table>
{% endblock %}
@app.route("/")
@login_required
def index():
"""Show portfolio of stocks"""
user_id = session["user_id"]
# Fetch user's stock portfolio
stocks = db.execute("SELECT symbol, SUM(shares) as total_shares FROM transactions WHERE user_id = ? GROUP BY symbol HAVING total_shares > 0", user_id)
cash = db.execute("SELECT cash FROM users WHERE id = ?", user_id)[0]["cash"]
# Initial variables for total values
total_value = cash
grand_total = cash
for stock in stocks:
quote = lookup(stock["symbol"])
stock["name"] = quote["name"]
stock["price"] = quote["price"]
stock["value"] = stock["price"] * stock["total_shares"]
total_value += stock["value"]
grand_total += stock["value"]
return render_template("index.html", stocks=stocks, cash=usd(cash), total_value=usd(total_value), grand_total=usd(grand_total))
@app.route("/buy", methods=["GET", "POST"])
@login_required
def buy():
"""Buy shares of stock"""
if request.method == "POST":
# Get user inputs from the form
symbol = request.form.get("symbol").upper()
shares = request.form.get("shares")
# Validate inputs
if not symbol:
return apology("Must give Symbol")
elif not shares or not shares.isdigit() or int(shares) <= 0:
return apology("Shares must be a positive integer")
# Lookup stock information
stock = lookup(symbol)
if stock is None:
return apology("Symbol does not exist")
# Calculate transaction value
transaction_value = int(shares) * stock["price"]
# Get user information
user_id = session["user_id"]
user_cash_db = db.execute("SELECT cash FROM users WHERE id = ?", user_id)
user_cash = user_cash_db[0]["cash"]
# Check if the user can afford the transaction
if user_cash < transaction_value:
return apology("Not enough money")
# Update user's cash
update_cash = user_cash - transaction_value
db.execute("UPDATE users SET cash = ? WHERE id = ?", update_cash, user_id)
# Update transactions table
date = datetime.datetime.now()
db.execute(
"INSERT INTO transactions (user_id, symbol, shares, price, date) VALUES (?, ?, ?, ?, ?)",
user_id, stock["symbol"], shares, stock["price"], date
)
flash(f"Bought {shares} of {symbol} for {usd(transaction_value)}, Updated cash: {usd(update_cash)}")
return redirect("/")
else:
return render_template("buy.html")
<td>{{ stock.price | usd }}</td>
<td>{{ (stock.price * stock.total_shares) | usd }}</td>
flash(f"Bought {shares} of {symbol} for {usd(transaction_value)}, Updated cash: {usd(update_cash)}")