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app.py
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app.py
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import urllib.request
from tkinter import *
from tkinter import messagebox
from stock import Stock
class Application(Frame):
def __init__(self, root):
super().__init__(root)
self.grid()
root.protocol("WM_DELETE_WINDOW", self.close) #Use my callback for closing
#First row of widgets
self.commandLabel = Label(self, text="Commands:")
self.refreshButton = Button(self, text="Refresh", command=self.refresh)
self.saveButton = Button(self, text="Save", command=self.save)
self.quitButton = Button(self, text="Quit", command=self.close)
self.deleteButton = Button(self, text="Delete", command=self.deleteStock)
#Grid the first row of widgets
self.commandLabel.grid(row=0, column=0, sticky=E)
self.refreshButton.grid(row=0, column=1)
self.saveButton.grid(row=0, column=2)
self.quitButton.grid(row=0, column=3)
self.deleteButton.grid(row=0, column=4)
#Second row of widgets
self.newLabel = Label(self, text="New Stock:")
self.entry = Entry(self, width=22, fg="#757575")
self.addButton = Button(self, text="Add", command=self.addStock)
#Grid the second row of widgets
self.newLabel.grid(row=1, column=0, sticky=E)
self.entry.insert(0, "Enter a stock ticker symbol")
self.entry.bind("<Button-1>", self.resetEntry)
self.entry.bind("<Return>", self.addStock)
self.entry.grid(row=1, column=1, columnspan=3)
self.addButton.grid(row=1, column=4)
#Add the frame that will display the portfolio widget
self.pFrame = LabelFrame(self, text="Your Portfolio", font="Consolas 18 bold", labelanchor=N)
self.pFrame.grid(columnspan=10, sticky=E+W)
self.pFrame.columnconfigure(0, weight=1)
self.portfolio = Listbox(self.pFrame, height=15, font="Consolas 16 bold")
self.portfolio["bg"] = "#D4E9FF" #"#b8dfd8"
self.portfolio["cursor"] = "hand2"
self.portfolio["bd"] = 2
self.portfolio["selectborderwidth"] = 5
self.portfolio["activestyle"] = "none"
self.portfolio.grid(sticky=E+W, columnspan=10)
#Some less GUI related variables that I will need
self.money = "#008B00" #color for stocks that are positive
self.myPortfolio = [] #stores all the Stock objects in portfolio widget
self.portFile = "portfolio.txt" #input file
#Try to initialize portfolio via input file if present
try:
f = open(self.portFile, "r")
for ticker in f:
self.myPortfolio.append(Stock(ticker.strip())) #Use tickers only
f.close()
self.refresh() #Refresh to update all stocks and the GUI
except FileNotFoundError:
pass
#Enables automatic refreshes every 30 seconds
self.after(30000, self.refreshWrapper)
#Handles all actions related to adding a new stock to portfolio
def addStock(self, event = None):
#Check for nothing or spaces
if self.entry.get().strip() == "":
messagebox.showwarning("No Entry", "Enter a valid stock ticker symbol")
self.entry.delete(0, END)
else:
#Make the API request and save the response
company = self.entry.get().strip().upper()
query1 = "http://finance.yahoo.com/d/quotes.csv?s="
query2 = "&f=nl1c1p2"
response = urllib.request.urlopen(query1 + company + query2)
data = response.read()
text = data.decode()
#Invalid case
if "N/A" in text:
messagebox.showerror("Invalid Entry", "This stock does not exist" \
+ " or data could not be pulled for it.")
#Valid case
else:
#Create a new stock object with the raw parameters for processing
newStock = Stock(company, text)
#Check if stock is already in portfolio, else --> add it
for s in self.myPortfolio:
if s.getTicker() == newStock.getTicker():
messagebox.showwarning("Repeated Entry", "This stock is" \
+ " already in your portfolio")
self.resetEntry(None)
return
self.myPortfolio.append(newStock)
toDisplay = newStock.stringify()
#Add to portfolio and determine color (gain/loss)
self.portfolio.insert(END, toDisplay[0])
self.portfolio.see(END)
if toDisplay[1] == "gain":
self.portfolio.itemconfig(END, fg=self.money, selectbackground="green")
elif toDisplay[1] == "loss":
self.portfolio.itemconfig(END, fg="red", selectbackground="red")
else:
self.portfolio.itemconfig(END, fg="#B2B200", selectbackground="yellow")
#Clear the entry field regardless
self.resetEntry(None)
#Deleting a stock from the portfolio
def deleteStock(self):
#Check if anything to delete
if len(self.myPortfolio) == 0:
return
#Find the stock in portfolio and remove
ticker = self.portfolio.get(ACTIVE).split()[0]
for s in self.myPortfolio:
if s.getTicker() == ticker:
self.myPortfolio.remove(s)
#Rehighlight the next stock
self.portfolio.delete(ACTIVE)
self.portfolio.selection_set(ACTIVE)
#Used when user refreshes portfolio OR portfolio is initialized by text file
def refresh(self):
#Check if anything to refresh
if len(self.myPortfolio) == 0:
return
#Delete all current entries
activeIndex = self.portfolio.index(ACTIVE)
self.portfolio.delete(0, END)
#Construct a chain of ticker symbols for the companies in the portfolio
companies = ""
for s in self.myPortfolio:
companies += s.getTicker() + "+"
companies = companies[:-1]
#Make one large API request and save the response
query1 = "http://finance.yahoo.com/d/quotes.csv?s="
query2 = "&f=nl1c1p2"
response = urllib.request.urlopen(query1 + companies + query2)
data = response.read()
text = data.decode()
#Update all the stocks
stockList = text.strip().split("\n")
for i in range(len(stockList)):
self.myPortfolio[i].update(stockList[i])
#Add the updated stocks back to the portfolio
for s in self.myPortfolio:
toDisplay = s.stringify()
self.portfolio.insert(END, toDisplay[0])
if toDisplay[1] == "gain":
self.portfolio.itemconfig(END, fg=self.money, selectbackground="green")
elif toDisplay[1] == "loss":
self.portfolio.itemconfig(END, fg="red", selectbackground="red")
else:
self.portfolio.itemconfig(END, fg="#B2B200", selectbackground="yellow")
self.portfolio.activate(activeIndex)
self.portfolio.selection_set(ACTIVE)
self.portfolio.see(ACTIVE)
#Used to enable automatic refresh
def refreshWrapper(self):
self.refresh()
self.after(30000, self.refreshWrapper)
#Event handler when user first clicks on the entry field
def resetEntry(self, event):
self.entry.delete(0,END)
self.entry["fg"] = "black"
#When user explicitly saves the file
def save(self):
#Open the portfolio text file and save all the tickers
f = open(self.portFile, "w")
for s in self.myPortfolio:
print(s.getTicker(), file = f)
f.close()
#Display success message
message = "Saved " + str(self.portfolio.size()) + " companies to your portfolio."
messagebox.showinfo("Saved!", message)
#When user explicitly presses my "close" button or [X] out of the window
def close(self):
if messagebox.askyesno("Quit", "Are you sure? Did you save first?"):
self.quit()