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application.py
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application.py
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#cs 50 is a library, SQL is the specific function
from cs50 import SQL
from flask import Flask, flash, redirect, jsonify, render_template, request, session, url_for
from flask_session import Session
from passlib.apps import custom_app_context as pwd_context
from tempfile import mkdtemp
import time
import csv
import os
import urllib.request
from flask import Flask, jsonify, render_template, request
from flask.exthook import ExtDeprecationWarning
from warnings import simplefilter
simplefilter("ignore", ExtDeprecationWarning)
from flask_autoindex import AutoIndex
app = Flask(__name__)
#why do we need to comment the next line?
#AutoIndex(app, browse_root=os.path.curdir)
from helpers import *
# configure application
#app = Flask(__name__)
# ensure responses aren't cached
if app.config["DEBUG"]:
@app.after_request
def after_request(response):
response.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
response.headers["Expires"] = 0
response.headers["Pragma"] = "no-cache"
return response
# custom filter
app.jinja_env.filters["usd"] = usd
# configure session to use filesystem (instead of signed cookies)
#temporary data stored on one's computer that shows what happened on that device
app.config["SESSION_FILE_DIR"] = mkdtemp()
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.route("/")
@login_required
def index():
#display what the user currently own, in other words, the info in the portfolio table
#use the id--the primary key, to find username
row = db.execute('SELECT*FROM users WHERE id=:id', id=session['user_id'])
cash = row[0]['cash']
#define username
user = row[0]["username"]
#look for the rows in the portfolio table by username--get all the purchase/sale data under the user who is currently logged in
result = db.execute("SELECT * FROM portfolio WHERE username=:username", username=user)
#if the user has made purchase/sale, get the data, put it in the dict, and display it on index
if result:
#create the dict
dict={}
dict['Symbol']=[]
dict['Name']=[]
dict['Shares']=[]
dict['Price']=[]
dict['Total']=[]
#if the user has made purchase/sale, get the data, put it in the dict, and display it on index
rows = db.execute('SELECT*FROM portfolio WHERE username=:username', username=user)
#calculate the total amount of money
t = 0
#make the for loop
for row in rows:
#append--add the parameter to the list, in this case, dict["Symbol"]
#this for loop adds all the ['key'] values in rows to the cooresponding dict, which are displayed on index
dict['Symbol'].append(row['symbol'])
dict['Shares'].append(row['shares'])
#for every symbol, look up the price
symbol=row['symbol']
quote = lookup(symbol)
price=quote["price"]
#calculate the total of each purchase:
#for each row, grab the number of shares, and multiply it by the price
shares=row['shares']
total=price*shares
#add all the totals together
t=t + total
#continue to append the parameters into the dict
dict['Name'].append(quote['name'])
dict['Price'].append(usd(quote['price']))
dict['Total'].append(usd(total))
#add the final total to cash=the total value of the stocks and the cash--the total value of the user's property
t = t + cash
#the variable length--how many row there are
length=len(dict['Symbol'])
#return to the index and display the info about the stocks currently owned by the user, cash and the total
#pass on the variables so that the html file can 'see' and display them
return render_template('index.html',dict=dict,t=t,cash=cash,length=length)
#if the user has not made any purchase, then the length will be zero, the total will be cash, and the dict will be empty
else:
#Doris, you dummy, REMEMBER TO USE PARENTHESIS FOR FUNCTIONS and BRACKETS for DICTS
return render_template("index.html",length=0,cash=cash,t=cash,dict=[])
@app.route("/buy", methods=["GET", "POST"])
@login_required
def buy():
"""Buy shares of stock."""
if request.method=="POST":
symbol = request.form.get('symbol')
shares = int(request.form.get('shares'))
#quote is a dictionary
quote = lookup(symbol)
id=session['user_id']
if not symbol:
return apology('Symbol can\'t be blank!')
if not quote:
return apology("symbol does not exist")
if not shares>0:
return apology("Shares must be positive!")
if not shares:
return apology("Shares cannot be blank!!")
#price=value, use the dict--quote to match up the values 'price'
# ["name"] is used for dict in python
price = quote['price']
rows = db.execute("SELECT * FROM users WHERE id=:id", id=session['user_id'])
cash = rows[0]["cash"]
username = rows[0]['username']
total= price*shares
transacted=time.strftime("%H:%M:%S %d/%m/%Y")
#ensure that the user can afford the stocks
if total>cash:
return apology("Sorry, too many stocks!")
#if the user can afford, update the cash and insert the purchase data into the history table
else:
cash=cash-total
db.execute("UPDATE users set cash=:cash where id=:id", cash=cash,id=session['user_id'])
db.execute("INSERT INTO history (symbol,shares,price,transacted,id)values (:symbol,:shares,:price,:transacted,:id)",symbol=symbol,shares=shares,price=price,transacted=transacted,id=id)
#check if the user alreay owinns a certain stock
result=db.execute("SELECT*FROM portfolio Where username=:username And symbol=:symbol",username=username,symbol=symbol)
#if the user has this kind of stock, update the shares
if result:
old_shares=result[0]['shares']
final_shares=old_shares+shares
db.execute('UPDATE portfolio set shares=:shares where username=:username AND symbol=:symbol',username=username,symbol=symbol,shares=final_shares)
#if the user does not own this stock, insert a new row
else:
db.execute("INSERT INTO portfolio (username,shares,symbol) values (:username,:shares,:symbol)",username=username,symbol=symbol,shares=shares)
#the "output" of the function--dircect the user to the index page, where the info is displayed
return redirect(url_for("index"))
else:
return render_template("buy.html")
#get variables symbol and shares
#symbol --> price and other stuff
#check portfolio table to see if symbol already exists
#price * shares
#check to see if cash is enough
#apology too many shares
#INSERT or UPDATE number of shares / row, remember username
@app.route("/history")
@login_required
def history():
id=session["user_id"]
rows=db.execute("SELECT*FROM history WHERE id=:id",id=id)
if len(rows)==0:
return ("No history!")
dict={}
dict['Symbol']=[]
dict['Shares']=[]
dict['Price']=[]
dict['transacted']=[]
for row in rows:
dict['Symbol'].append(row["symbol"])
dict['Shares'].append(row["shares"])
dict['Price'].append(row["price"])
dict['transacted'].append(row["transacted"])
length=len(dict['Symbol'])
return render_template("history.html",length=length,dict=dict)
@app.route("/login", methods=["GET", "POST"])
def login():
"""Log user in."""
# # forget any user_id
session.clear()
# # if 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")
# # ensure password was submitted
elif not request.form.get("password"):
return apology("must provide password")
# # query database for username
rows = db.execute("SELECT * FROM users WHERE username = :username", username=request.form.get("username"))
# # ensure username exists and password is correct
if len(rows) != 1 or not pwd_context.verify(request.form.get("password"), rows[0]["hash"]):
return apology("invalid username and/or password")
# # remember which user has logged in
session["user_id"] = rows[0]["id"]
# # redirect user to home page
return redirect(url_for("index"))
# # else if 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(url_for("login"))
#get to the quote page
#one function can only give one output
@app.route("/quote")
@login_required
def quote():
return render_template("ajax.html")
#get to the yahoo page
@app.route("/get_quote")
def get_quote():
url = "http://download.finance.yahoo.com/d/quotes.csv?f=snl1&s={}".format(request.args.get("symbol"))
webpage = urllib.request.urlopen(url)
#read the data, decode whatever yahoo gives back, breaks down the form into lines and then break down the line into words
datareader = csv.reader(webpage.read().decode("utf-8").splitlines())
row = next(datareader)
return jsonify({"name": row[1], "price": float(row[2]), "symbol": row[0].upper()})
# if not url:
# return apology('Symbol does not exist!')
# def quote():
# if request.method=='POST':
# #which form is symbol stored in?
# symbol = request.form.get('symbol')
# #calls the lookup function in helpers.py
# #lookup is the function specified in helpers.py
# #We are imputting the variabel symbol into the lookup function and assigning the output to be the variable quote
# quote = lookup(symbol)
# #ensure the symbol ecists
# if not quote:
# return apology("symbol does not exist")
# #tells variable price to get the value from the ['price'] dict we got
# price = quote['price']
# #change the unit to usd
# price=usd(price)
# #tells the variable'name' to get the value from the dict ["name"] we got from quote
# name = quote['name']
# #successfully got all the variables, direct the user to quoted.html, pass on all the variables that will be displayed in quoted
# return render_template("quoted.html", price=price, symbol=symbol, name=name)
# #if the method is not POST, return to quote.html
# else:
# return render_template("quote.html")
#GET allows the user to get to the register page, while POST allows the data to be inserted into the database
@app.route("/register", methods=["GET", "POST"])
#define the function
def register():
#if the user is not sending any input, return to the register page. By doing so, we ensure the user is inputting username and password
if request.method=='POST':
#request.form.get ("a") is slightly safer than request.form ["a"] when a exists
if not request.form.get ("username"):
return apology("Missing Username")
#if the username already exists
rows = db.execute("SELECT * FROM users WHERE username = :username", username=request.form.get("username"))
if len(rows) != 0:
return apology("This username already exists")
#if the password is blank:
if not request.form.get ("password"):
return apology("Missing password!")
#if the password and the confirmation don't match
#for line250, both request.form.get["paswsword"] and quest.form("password") will work
if request.form.get("password")!=request.form.get("confirmation"):
return apology("Passwords do not match!")
else:
#save the password as hash, encrypt it. If anyone hacks into the database, he/she won't be able to see all the passwords
hash=pwd_context.encrypt(request.form.get("password"))
db.execute("INSERT INTO users (username,hash) values(:username,:password)",username=request.form.get("username"),password=hash)
#in this case, you are sure the username exists in the table, so stick with request.form.get("username")
rows = db.execute("SELECT * FROM users WHERE username=:username", username=request.form.get('username'))
# remember which user has logged in
#session is the temporary memory. The user info in stored in session. Once the user log out, the session info may disappear
session["user_id"] = rows[0]["id"]
#if the user completes the register without any mistake, she will be redirected to the index page.
return redirect (url_for("index"))
#if the method is not POST (which allows the user to input data into the user table), return to the register page
#in what case can the method be GET or whatever besides POST?
else: return render_template ("register.html")
@app.route("/sell", methods=["GET", "POST"])
@login_required
def sell():
if request.method=="POST":
#call the symbol from the form as the user submit it
symbol = request.form.get('symbol')
shares=request.form.get('shares')
#define the username by id
#the username will be used as the key to look up the stock in the portfolio table
id=session['user_id']
rows = db.execute("SELECT * FROM users WHERE id=:id", id=id)
username = rows[0]['username']
#use the username and the symbol input by the user to see if the user owns that stock
row=db.execute('SELECT*FROM portfolio Where symbol=:symbol AND username=:username',symbol=symbol,username=username)
#if there is no row, the user does not own this stock, then return an apology
if not symbol:
return apology("Symbol cannot be blank!")
if not shares:
return apology("Shares cannot be blank!")
if len(row)==0:
return apology ("This stock does not exist in your account")
def RepresentsInt(shares):
try:
int(shares)
return True
except ValueError:
return False
#since the data type is text in the html, change it into inetger here
if RepresentsInt(request.form.get('shares')):
shares1 = int(request.form.get('shares'))
else:
return apology("Shares must be an integer!")
if shares1<0:
return apology('Shares must be positive!')
#if there is a row (only one row since we are updating the data), take the symbol, old number of shares, and old cash from the table
symbol=row[0]["symbol"]
shares2=row[0]["shares"]
cash = rows[0]['cash']
#calculate the new cash
shares3=shares2-shares1
#if the user wants to sell more shares than she owns, return an apology
if shares1>shares2:
return apology ("Too many stocks!")
#since the symbol exists, use this to look up the current price
quote = lookup(symbol)
price=quote["price"]
#calculate the amount of money the user makes by selling the stocks
total=price*shares1
#calculate the new_cash, which will be used to update the cash in the users table
new_cash=cash+total
#get the negative value for history
shares4=0-shares1
#get the time for history
transacted=time.strftime("%H:%M:%S %d/%m/%Y")
#insert the data into the history table
db.execute("INSERT INTO history (symbol,shares,price,transacted,id)values (:symbol,:shares,:price,:transacted,:id)",symbol=symbol,shares=shares4,price=price,transacted=transacted,id=id)
#if the user is selling all the stocks of one kind that she has, delete that row in the portfolio table and update the cash in the users table
if shares3==0:
db.execute ("DELETE FROM portfolio WHERE username=:username AND symbol=:symbol",symbol=symbol,username=username)
db.execute("UPDATE users SET cash=:new_cash WHERE username=:username AND id=:id",id=id,username=username,new_cash=new_cash)
#if the user is not selling all she has, update the data
if shares1<shares2:
db.execute("UPDATE portfolio set shares=:shares3 WHERE username=:username AND symbol=:symbol",symbol=symbol,username=username,shares3=shares3)
db.execute("UPDATE users SET cash=:new_cash WHERE username=:username AND id=:id",id=id,username=username,new_cash=new_cash)
#after the user making a sale, return to the index page, and let the user see the change in the shares, cash and total (both the total for that stock and t)
return redirect(url_for("index"))
else:
return render_template("sell.html")
"""Sell shares of stock."""