Welcome folks today in this post we will be building a realtime international currency converter in tkinter using web scraping in python. All the full source code of the application is shown below.

Get Started

In order to get started you need to make an app.py file and copy paste the following code

app.py

import requests
import tkinter as tk
from xml.etree import ElementTree as ET



r = requests.get('http://www.ecb.int/stats/eurofxref/eurofxref-daily.xml', stream=True)

tree = ET.parse(r.raw)
rootXML = tree.getroot()

namespaces = {'ex': 'http://www.ecb.int/vocabulary/2002-08-01/eurofxref'}

currencyList = []

for cube in rootXML.findall('.//ex:Cube[@currency]', namespaces=namespaces):
    currencyList.append(cube.attrib['currency'])
    print(cube.attrib['currency'], cube.attrib['rate'])


class CurrencyConverter(tk.Tk):
    def __init__(self, parent):
        tk.Tk.__init__(self, parent)
        self.parent = parent
        self.geometry('550x300+800+400')
        self.resizable(width=False, height=False)
        self.initialize()

    def initialize(self):
        self.grid()

        # Title
        self.label = tk.Label(self, text="Currency Converter", fg='darkblue', font=("Helvetica", 16))
        self.label.grid(row=0, padx=15, pady=15)

        # Amount
        self.label = tk.Label(self, text="Convert this amount")
        self.label.grid(row=2, column=0, pady=5, padx=18, sticky=tk.E)
        self.var = tk.DoubleVar()
        self.E1 = tk.Entry(self, bd=2, textvariable=self.var, justify=tk.RIGHT)
        self.E1.grid(row=3, column=0, pady=5, padx=5, sticky=tk.E, ipady=2)

        #OptionMenu
        self.label = tk.Label(self, text="From this currency")
        self.label.grid(row=2, column=1, pady=10, padx=15, sticky=tk.W)
        self.variable1 = tk.StringVar(self)
        self.variable1.set(currencyList[0])
        self.E2 = tk.OptionMenu(self, self.variable1, *currencyList)
        self.E2.config(width=15)
        self.E2.grid(row=3, column=1, sticky=tk.E)

        #OptionMenu
        self.label = tk.Label(self, text="To this currency")
        self.label.grid(row=2, column=2, pady=10, padx=15, sticky=tk.W)
        self.variable2 = tk.StringVar(self)
        self.variable2.set(currencyList[0])
        self.E3 = tk.OptionMenu(self, self.variable2, *currencyList)
        self.E3.config(width=15)
        self.E3.grid(row=3, column=2, padx=10, sticky=tk.E)

        #Result
        self.label = tk.Label(self, text="Result", font=("Helvetica", 18))
        self.label.grid(row=4, column=0, pady=35, sticky=tk.E)
        self.variable3 = tk.DoubleVar()
        self.E4 = tk.Entry(self, bd=2, textvariable=self.variable3, justify=tk.RIGHT)
        self.E4.grid(row=4, column=1, ipady=3, padx=10, sticky=tk.E)

        #Buttons
        self.button = tk.Button(self, text='Convert', command=self.currencyCalculate, width=12, height=2)
        self.button.grid(row=5, column=1, padx=5, sticky=tk.E)
        self.button = tk.Button(self, text='Close', command=self.currencyCalculate,  width=12, height=2)
        self.button.grid(row=5, column=2, sticky=tk.W)


    def currencyCalculate(self):
        user_input = self.var.get()
        option_menu_input1 = self.variable1.get()
        option_menu_input2 = self.variable2.get()
        for cube in rootXML.findall('.//ex:Cube[@currency]', namespaces=namespaces):
            if cube.attrib['currency'] == option_menu_input1:
                to_dollars = float(user_input) / float(cube.attrib['rate'])

                for cube in rootXML.findall('.//ex:Cube[@currency]', namespaces=namespaces):
                    if cube.attrib['currency'] == option_menu_input2:
                        result = to_dollars * float(cube.attrib['rate'])
                        self.variable3.set(round(result, 2))
                        return result


if __name__ == "__main__":
    app = CurrencyConverter(None)
    app.title('My Currency Converter')
    app.mainloop()

Now if you execute the python script by typing the below command as shown below

python app.py