您好，我是新来的，需要帮助。我刚刚做了我的 cs50 财务问题。一切正常，您可以买入、卖出、查看报价价格、查看交易历史记录。但是当我尝试检查 50 时，它显示了这个错误。另外，在 html 文件中我已经做了 '|美元'作为推荐。它显示了应有的一切。我知道代码很大，但是 check50 部分这样说 - “请注意，check50 会将整个程序作为一个整体进行测试。如果在完成所有必需的功能之前运行它，它可能会报告实际上正确但依赖于其他功能的功能的错误功能。”
import os
from cs50 import SQL
from flask import Flask, flash, redirect, render_template, request, session
from flask_session import Session
from werkzeug.security import check_password_hash, generate_password_hash
from helpers import apology, login_required, lookup, usd
# Configure application
app = Flask(__name__)
# Custom filter
app.jinja_env.filters["usd"] = usd
# Configure session to use filesystem (instead of signed cookies)
app.config["SESSION_PERMANENT"] = False
app.config["SESSION_TYPE"] = "filesystem"
Session(app)
# Configure CS50 Library to use SQLite database
db = SQL("sqlite:///finance.db")
@app.after_request
def after_request(response):
"""Ensure responses aren't cached"""
response.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
response.headers["Expires"] = 0
response.headers["Pragma"] = "no-cache"
return response
@app.route("/")
@login_required
def index():
"""Show portfolio of stocks"""
# Main variables
user_id = session["user_id"]
user_cash = db.execute("SELECT cash FROM users WHERE id == ?", user_id)[0]["cash"]
counter = 0
shares_total = 0
user_info = db.execute("SELECT user_id, symbol, SUM(shares) as shares, price, total, MAX(timestamp) as timestamp FROM info WHERE user_id == ? AND shares > 0 GROUP BY symbol", user_id)
counter = len(user_info)
# MAIN calculation loop
if counter != 0:
for j in range(1):
for i in range(counter):
symbol = user_info[i]["symbol"]
price = lookup(symbol)["price"]
total = price * user_info[i]["shares"]
cash = user_cash - total
# This if statement means if there is more symbol and shares the do this
if counter > 1:
shares_total += user_info[i]["total"]
elif counter == 1:
shares_total = user_info[i]["total"]
db.execute("UPDATE info SET price == ?, total == ? WHERE user_id == ? AND symbol == ?", price, total, user_id, symbol)
# Select current cash and then incriment
cash = db.execute("SELECT cash FROM users WHERE id == ?", user_id)[0]["cash"]
main_total = cash + shares_total
return render_template("layout.html", user_info = user_info, i=i, counter = counter, total = total, price = price, tottal = main_total, cash = cash)
else:
return render_template("layout.html", cash = user_cash, tottal = user_cash, counter = counter)
@app.route("/buy", methods=["GET", "POST"])
@login_required
def buy():
"""Buy shares of stock"""
if request.method == "GET":
return render_template("buy.html")
else:
user_id = session["user_id"]
input_shares = request.form.get("shares")
cash = db.execute("SELECT cash FROM users WHERE id == ?", user_id)[0]["cash"]
# Erro hendling statements
try:
input_shares = int(request.form.get("shares"))
except ValueError:
return apology("shares must be a posative integer", 400)
input_shares = int(input_shares)
if input_shares <= 0:
return apology("Shares number should be more then 0")
if lookup(request.form.get("symbol")) is None:
return apology("Please enter valid quotes")
price = lookup(request.form.get("symbol"))["price"]
if cash < price * input_shares:
return apology("You don't have enough money")
symbol = lookup(request.form.get("symbol"))["name"]
shares = db.execute("SELECT shares FROM info WHERE user_id == ? AND symbol == ?", user_id, symbol)
# This statemen is for error hendling, it's neccesery because if there is no purchase yet
# It will purchase some shares and then return
if len(shares) == 0:
total = price * input_shares
cash -= total
db.execute("UPDATE users SET cash == ? WHERE id == ?", cash, user_id)
db.execute("INSERT INTO info (user_id, symbol, shares, price, total) VALUES (?, ?, ?, ?, ?)", user_id, symbol, input_shares, price, total)
db.execute("INSERT INTO history_info (user_id, symbol, shares, price) VALUES (?, ?, ?, ?)", user_id, symbol, input_shares, price)
flash('You have bought!', 'success')
return redirect("/")
elif len(shares) > 0:
# ar dagaviwydes rom sheamowmo len(shares) im shemtxvevashi tu ki romelime stock bevri yidva gayidvis istoria aqvs
# da unda vnaxot ramdenad sworad gvichvenebs shares[0]["shares"] tavis monacems!!!!!!!!!!!!!!!!!!!!!!!!!
shares = db.execute("SELECT shares FROM info WHERE user_id == ? AND symbol == ?", user_id, symbol)
shares = shares[0]["shares"]
shares += input_shares
# Calculate and then Update all of the information into a SQL database
total = price * shares
cash = cash - price * input_shares
db.execute("UPDATE users SET cash == ? WHERE id == ?", cash, user_id)
db.execute("UPDATE info SET symbol == ?, price == ?, shares == ?, total == ? WHERE user_id == ? AND symbol == ?", symbol, price, shares, total, user_id, symbol)
db.execute("INSERT INTO history_info (user_id, symbol, shares, price) VALUES (?, ?, ?, ?)", user_id, symbol, input_shares, price)
flash('You have bought!', 'success')
return redirect("/")
@app.route("/history")
@login_required
def history():
"""Show history of transactions"""
# Main variables
user_id = session["user_id"]
info = db.execute("SELECT * FROM history_info WHERE user_id == ?", user_id)
counter = len(info)
# If there is not purchase yet it will return nothing
# Main code is inside HTML For loop and if statement
if not info:
return render_template("history.html", info = info)
else:
for i in range(counter):
return render_template("history.html", info = info, i = i, counter = counter)
@app.route("/login", methods=["GET", "POST"])
def login():
"""Log user in"""
# Forget any user_id
session.clear()
# User reached route via POST (as by submitting a form via POST)
if request.method == "POST":
# Ensure username was submitted
if not request.form.get("username"):
return apology("must provide username", 403)
# Ensure password was submitted
elif not request.form.get("password"):
return apology("must provide password", 403)
# Query database for username
rows = db.execute("SELECT * FROM users WHERE username = ?", request.form.get("username"))
# Ensure username exists and password is correct
if len(rows) != 1 or not check_password_hash(rows[0]["hash"], request.form.get("password")):
return apology("invalid username and/or password", 403)
# Remember which user has logged in
session["user_id"] = rows[0]["id"]
return redirect("/")
# User reached route via GET (as by clicking a link or via redirect)
else:
return render_template("login.html")
@app.route("/logout")
def logout():
"""Log user out"""
# Forget any user_id
session.clear()
# Redirect user to login form
return redirect("/")
@app.route("/quote", methods=["GET", "POST"])
@login_required
def quote():
"""Get stock quote."""
if request.method == "GET":
return render_template("quote.html")
else:
# save user input and give's it to the lookup function
symbol = lookup(request.form.get("symbol"))
# take price from lookup function
value = lookup(request.form.get("symbol"))
if symbol == None:
return apology("You need to sign correct Symbol")
# Take symbol's Name from dict
symbol = symbol["name"]
# Take Symbol's Price from dict
value = value["price"]
return render_template("quoted.html", symbol=symbol, value=value)
@app.route("/register", methods=["GET", "POST"])
def register():
"""Register user"""
session.clear()
name = request.form.get("username")
password = request.form.get("password")
confirm = request.form.get("confirmation")
# this will count, if there is excist username
check_users = db.execute("SELECT COUNT(*) FROM users WHERE username = ?", name)
# if there is match count_value dict will return 1
count_value = check_users[0]['COUNT(*)']
if request.method == "POST":
# Chek users registration form
if not name:
return apology("user’s input is blank")
elif not password:
return apology("Password input is blank")
elif not confirm:
return apology("Confirm password input is blank")
elif password != confirm:
return apology("Passwords do not match")
elif count_value != 0:
return apology("Username already exists")
# ransform password into hash
hashed_password = generate_password_hash(password, method='pbkdf2')
# if there is no apology, then this will insert users information into SQL
db.execute("INSERT INTO users(username, hash) VALUES(?, ?)", name, hashed_password)
# Query database for username
rows = db.execute("SELECT * FROM users WHERE username = ?", name)
# Remember which user has logged in
session["user_id"] = rows[0]["id"]
# this will let user know that registration succesfully complete
flash('You have successfully registered!', 'success')
# redirects to homepage
return redirect("/")
else:
return render_template("register.html")
@app.route("/sell", methods=["GET", "POST"])
@login_required
def sell():
"""Sell shares of stock"""
if request.method == "GET":
user_id = session["user_id"]
# Insert symbols with DISTINC method inside html section
# DISTINC avoides repeted symbols it will SELECT's only once
quotes = db.execute("SELECT DISTINCT symbol FROM info WHERE user_id == ? AND shares > 0", user_id)
return render_template("sell.html", quotes = quotes)
else:
# Main variables
user_id = session["user_id"]
symbol = request.form.get("symbol")
input_shares = int(request.form.get("sell-shares"))
if input_shares <= 0:
return apology("Number should be greater then zero")
# This is how we can have acces into symbol
# 12: means select chars from 12th char
# :-2 select last two char which is ' } and removes
symbol = symbol[12:][:-2]
price = lookup(symbol)["price"]
cash = db.execute("SELECT cash FROM users WHERE id == ?", user_id)[0]["cash"]
shares = db.execute("SELECT shares FROM info WHERE user_id ==? AND symbol == ?", user_id, symbol)[0]["shares"]
if shares < input_shares:
return apology("You don't have that many quotes")
shares -= input_shares
# Main calculation and Update SQL data
profit = input_shares * price
profit += cash
db.execute("UPDATE info SET shares = shares - ?, total = ? * ? WHERE user_id == ? AND symbol == ?", input_shares, shares, price, user_id, symbol)
db.execute("UPDATE users SET cash == ? WHERE id == ?", profit, user_id)
db.execute("INSERT INTO history_info (user_id, symbol, shares, price) VALUES (?, ?, -?, ?)", user_id, symbol, input_shares, price)
flash('Sold!', 'success')
return redirect("/")
我只是不明白为什么它显示错误。有没有可能问题出在空列表上？这个 TypeError 是由此引起的吗？
如果它说
NoneType object is not subscriptable[]NoneNone[anything]
保证
raiseTypeErrorNone__getitem__operator[]在代码中的某个地方，您正在尝试
somevar[somevalue]somevar is None