codingdirectional: Search for any particular currency pair within the Forex data

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If you still remember we have created a combo box for the currency pair in the last chapter, then now we will use that list of items to search for a particular currency pair from the incoming data from Coinbase. We will create a button which when pressed will show you the currency pair which you have selected from the combo box on the outcome label of this tkinter interface. We will use the search method from the Text widget to look for that currency pair and highlight the outcome. Below is the entire revised program.

from coinbase.wallet.client import Client
import json
from tkinter import *
import tkinter.ttk as tk

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

selectorFrame = Frame(win) # create a button frame
selectorFrame.pack(side = TOP, fill=X, pady = 6)
currency_label = Label(selectorFrame, text = "Select your currency pair :")
currency_label.pack(anchor="w") # the currency pair label
# Create a combo box for currency pair
select_currency = StringVar() # create a string variable
preferPaired = tk.Combobox(selectorFrame, textvariable=select_currency)
preferPaired.pack(side = LEFT)

s = StringVar() # change text
currencyFrame = Frame(win) # create currency frame
currencyFrame.pack(side=TOP)
currency = Label(currencyFrame)
currency.pack()
text_widget = Text(currency, fg='white', background='black')
text_widget.pack()

s.set("Click the below button to find out the bitcoin exchange rate")
text_widget.insert(END, s.get())

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

def search_currency():
    countVar = StringVar() # for future use
    text_widget.tag_remove("search", "1.0", "end") # cleared the hightlighted currency pair
    if(preferPaired.get() != ''):

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

action_search = tk.Button(selectorFrame, text="Search", command=search_currency) # find out the exchange rate of bitcoin
action_search.pack(side=LEFT)

def get_exchange_rate():

    f = open("coin.txt", "r")
    api_key = f.readline()
    api_secret = f.readline()
    f.close()

    sell_buy = ''

    api_key = api_key.replace('\n', '')
    api_secret = api_secret.replace('\n', '')

    try:
        client = Client(api_key, api_secret)
        market_currencies_o = client.get_exchange_rates()
        market_currencies_s = json.dumps(market_currencies_o)
        exchange_rate = json.loads(market_currencies_s)
        supported_currency = client.get_currencies() # get all the available currencies from coinbase
        exchange_rate_s = json.loads(json.dumps(supported_currency))

    except:
        print("An exception occurred")

    exchange_name_dict = dict()

    for key in exchange_rate_s['data']:
        id = key['id']
        name = key['name']
        obj_currency = {id:name}
        exchange_name_dict.update(obj_currency)

    count = 0
    found = False
    curr = tuple() # the tuple which will be populated by currency pairs

    for key in exchange_rate['rates']:
        count += 1
        c_st = exchange_rate['currency'] + "/" + key
        curr = curr + (c_st,)  # add the currency pairs
        for e_key in exchange_name_dict:
            if(e_key == key):
                sell_buy += str(count) + ".) Pair : " + exchange_rate['currency'] + "/" + key + " (" + exchange_name_dict[e_key] + ") : " + \
                exchange_rate['rates'][key] + '\n'
                found = True
                break
        if(found == False):
            sell_buy += str(count) + ".) Pair : " + exchange_rate['currency'] + "/" + key + " : " + \
                exchange_rate['rates'][key] + '\n'
        else:
            found = False
    preferPaired['values'] = curr
    preferPaired.current(0)  # select item one
    text_widget.delete('1.0', END) # clear all those previous text first
    s.set(sell_buy)
    text_widget.insert(INSERT, s.get())

action_vid = tk.Button(buttonFrame, text="Find", command=get_exchange_rate) # find out the exchange rate of bitcoin
action_vid.pack(fill=X)
win.mainloop()

If you run the above program to find the Forex data and then select any currency pair then pressed the search button you will get the below outcome.

The revised version of the @FOREX application software pic.twitter.com/srl0eFQ9xm

— whei choo (@ChooWhei) March 3, 2019

If you are new to this tutorial then you need to get the API key and secret from Coinbase before you can start to develop this application for your own use. The Coinbase account is free, you can sign up through this sign-up link.

I am a python developer and if you are a company founder then I am very keen to help you to promote your company product by creating free software on this website, if your product has provided any free API then do leave your comment under this post or any other post on this website so I can take a look at your product. Again, this site needs support from you all, readers, do consider to donate to this site to help this site pays for the rent. Thank you.

We will continue developing this Forex application in the next chapter!

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