Further modifying the stock and forex application

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In this chapter we will continue to develop our Forex and Stock application. We have created a method to retrieve and plot the stock value vs time interval on a graph in the previous chapter and in this chapter we will create a combo box and populate it with the stock symbols so a user can select any stock he wishes to plot before calling the plot stock exchange method again.

We will just create a text file and enter one sock symbol per line and then read those symbols in a for loop and put them into a tuple of the stock combo box.

import json
from tkinter import *
import tkinter.ttk as tk
from alpha_vantage.foreignexchange import ForeignExchange
from alpha_vantage.timeseries import TimeSeries
import matplotlib.pyplot as plt

win = Tk() # Create tk instance
win.title("Real Forex n Stock") # Add a title
win.resizable(0, 0) # Disable resizing the GUI
win.configure(background='white') # change window background color

selectorFrame = Frame(win, background="white") # create the top frame to hold base and quote currency combobox
selectorFrame.pack(anchor = "nw", pady = 2, padx=10)
currency_label = Label(selectorFrame, text = "Select base currency / quote currency / stock :", background="white")
currency_label.pack(anchor="w") # the currency pair label

curr1 = tuple() # the tuple which will be populated by base and quote currency
currency_list = ['AUD', 'BCH', 'BNB', 'BND', 'BTC', 'CAD', 'CHF', 'CNY', 'EOS', 'EUR', 'ETH', 'GBP', 'HKD', 'JPY', 'LTC', 'NZD', 'MYR', 'TRX', 'USD', 'USDT', 'XLM', 'XRP'] # major world currency pairs

# populate the combo box for both the base and quote currency
for key in currency_list:
    curr1 += (key, )

# populate the stock symbol tuple
f = open("stock.txt", "r")
curr2 = tuple()
for line in f.readlines():
    curr2 += (line.replace('\n', ''),)
f.close()

# Create a combo box for base currency
base_currency = StringVar() # create a string variable
based = tk.Combobox(selectorFrame, textvariable=base_currency)
based['values'] = curr1
based.pack(side = LEFT, padx=3)

# Create a combo box for quote currency
quote_currency = StringVar() # create a string variable
quote = tk.Combobox(selectorFrame, textvariable=quote_currency)
quote['values'] = curr1
quote.pack(side = LEFT, padx=3)

# Create a combo box for stock
stock_symbol = StringVar() # create a string variable
stock = tk.Combobox(selectorFrame, textvariable=stock_symbol)
stock['values'] = curr2
stock.current(0)
stock.pack(side = LEFT, padx=3)

s = StringVar() # create string variable which will be used to fill up the Forex data
# create currency frame and text widget to display the incoming forex data
currencyFrame = Frame(win)
currencyFrame.pack(side=TOP)
currency = Label(currencyFrame)
currency.pack()
text_widget = Text(currency, fg='white', background='black')
text_widget.pack()
s.set("Click the find button to find out the currency exchange rate")
text_widget.insert(END, s.get())

buttonFrame = Frame(win) # create a bottom frame to hold the find button
buttonFrame.pack(side = BOTTOM, fill=X, pady = 6)

# first get the api key and secret from the file
f = open("alpha.txt", "r")
api_key = f.readline()
f.close()
api_key = api_key.replace('\n', '')

def get_exchange_rate(): # this method will display the incoming forex data after the api called

    try:
        cc = ForeignExchange(key= api_key)
        from_ = based.get()
        to_ = quote.get()

        countVar = StringVar()  # use to hold the character count
        text_widget.tag_remove("search", "1.0", "end")  # cleared the hightlighted currency pair

        if(from_ != '' and to_ != '' and from_ != to_):
            data, _ = cc.get_currency_exchange_rate(from_currency=from_, to_currency=to_)
            exchange_rate = dict(json.loads(json.dumps(data)))
            count = 1
            sell_buy = str(count) + ".) Pair : " + exchange_rate['1. From_Currency Code'] + "(" + exchange_rate['2. From_Currency Name'] + ")" + " / " + exchange_rate['3. To_Currency Code']+"(" + exchange_rate['4. To_Currency Name'] + ") : "  + str(exchange_rate['5. Exchange Rate']) + '\n'
            text_widget.delete('1.0', END)  # clear all those previous text first
            s.set(sell_buy)
            text_widget.insert(INSERT, s.get())  # display forex rate in text widget

            pos = text_widget.search(from_, "1.0", stopindex="end", count=countVar)
            text_widget.tag_configure("search", background="green")
            end_pos = float(pos) + float(0.7)
            text_widget.tag_add("search", pos, str(end_pos))  # highlight the background of the searched currency pair
            pos = float(pos) + 2.0
            text_widget.see(str(pos))

    except:
        print("An exception occurred")

def plot_stock_echange():

    try:
        stock_symbol_text = stock.get() # get the selected symbol
        if(stock_symbol_text!= ''):
            ts = TimeSeries(key=api_key, output_format='pandas')
            data, meta_data = ts.get_intraday(symbol=stock_symbol_text, interval='1min', outputsize='full')
            data['4. close'].plot()
            stock_title = 'Intraday Times Series for the ' + stock_symbol_text + ' stock (1 min)'
            plt.title(stock_title)
            plt.show()
    except:
        print("An exception occurred")

action_vid = tk.Button(buttonFrame, text="Find", command=get_exchange_rate) # button used to find out the exchange rate of currency pair
action_vid.pack()
action_stock_plot = tk.Button(buttonFrame, text="Plot Stock", command=plot_stock_echange) # button used to plot the intra-minute stock value
action_stock_plot.pack()

win.iconbitmap(r'ico.ico')
win.mainloop()

Now we can select any symbol from the stock combo box and retrieve the data we need to plot the graph. All the stock symbols above are those stocks that have been publicly listed on the New York Stock Exchange.

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