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Python | Real time currency convertor using Tkinter
  • Difficulty Level : Medium
  • Last Updated : 15 Sep, 2020

Prerequisites : Introduction to tkinter | Get the real time currency exchange rate

Python offers multiple options for developing GUI (Graphical User Interface). Out of all the GUI methods, tkinter is the most commonly used method. It is a standard Python interface to the Tk GUI toolkit shipped with Python. Python with tkinter outputs the fastest and easiest way to create the GUI applications.

To create a tkinter :

  • Importing the module – tkinter
  • Create the main window (container)
  • Add any number of widgets to the main window.
  • Apply the event Trigger on the widgets.

Let’s create a GUI based simple Real-time currency convertor (Using Alpha Vantage API) which can convert amounts from one currency to another currency.

Modules required:



tkinter
requests
json

Below is the implementation :




# import all functions from the tkinter 
from tkinter import *
  
# Create a GUI window
root = Tk()
  
# create a global variables 
variable1 = StringVar(root)
variable2 = StringVar(root)
  
# initialise the variables
variable1.set("currency")
variable2.set("currency")
  
      
# Function to perform real time conversion
# from one currency to another currency
def RealTimeCurrencyConversion():
  
    # importing required libraries
    import requests, json
  
    # currency code
    from_currency = variable1.get()
    to_currency = variable2.get()
  
    # enter your api key here 
    api_key = "Your_Api_Key"
      
    # base_url variable store base url 
    base_url = r"https://www.alphavantage.co/query?function = CURRENCY_EXCHANGE_RATE"
  
    # main_url variable store complete url
    main_url = base_url + "&from_currency =" + from_currency + 
        "&to_currency =" + to_currency + "&apikey =" + api_key
  
    # get method of requests module 
    # return response object 
    req_ob = requests.get(main_url)
  
    # json method return json format
    # data into python dictionary data type.
      
    # result contains list of nested dictionaries
    result = req_ob.json()
  
    # parsing the required information
    Exchange_Rate = float(result["Realtime Currency Exchange Rate"]
                                              ['5. Exchange Rate'])
  
    # get method of Entry widget
    # returns current text  as a
    # string from text entry box.
    amount = float(Amount1_field.get())
  
    # calculation for the conversion
    new_amount = round(amount * Exchange_Rate, 3)
  
    # insert method inserting the 
    # value in the text entry box. 
    Amount2_field.insert(0, str(new_amount))
  
  
# Function for clearing the Entry field
def clear_all() :
    Amount1_field.delete(0, END) 
    Amount2_field.delete(0, END)
     
  
# Driver code
if __name__ == "__main__" :
  
    # Set the background colour of GUI window 
    root.configure(background = 'light green'
    
    # Set the configuration of GUI window (WidthxHeight)
    root.geometry("400x175"
    
    # Create welcome to Real Time Currency Convertor label 
    headlabel = Label(root, text = 'welcome to Real Time Currency Convertor'
                      fg = 'black', bg = "red"
  
    # Create a "Amount :" label 
    label1 = Label(root, text = "Amount :",
                 fg = 'black', bg = 'dark green')
      
    # Create a "From Currency :" label 
    label2 = Label(root, text = "From Currency"
                   fg = 'black', bg = 'dark green'
    
    # Create a "To Currency: " label 
    label3 = Label(root, text = "To Currency :"
                   fg = 'black', bg = 'dark green')
  
    # Create a "Converted Amount :" label 
    label4 = Label(root, text = "Converted Amount :"
                   fg = 'black', bg = 'dark green')
  
    # grid method is used for placing 
    # the widgets at respective positions 
    # in table like structure .  
    headlabel.grid(row = 0, column = 1
    label1.grid(row = 1, column = 0
    label2.grid(row = 2, column = 0)
    label3.grid(row = 3, column = 0)
    label4.grid(row = 5, column = 0)
      
    # Create a text entry box 
    # for filling or typing the information. 
    Amount1_field = Entry(root) 
    Amount2_field = Entry(root)
       
    # ipadx keyword argument set width of entry space. 
    Amount1_field.grid(row = 1, column = 1, ipadx ="25"
    Amount2_field.grid(row = 5, column = 1, ipadx ="25")
  
    # list of currency codes
    CurrenyCode_list = ["INR", "USD", "CAD", "CNY", "DKK", "EUR"]
  
    # create a drop down menu using OptionMenu function
    # which takes window name, variable and choices as
    # an argument. use * befor the name of the list,
    # to unpack the values
    FromCurrency_option = OptionMenu(root, variable1, *CurrenyCode_list)
    ToCurrency_option = OptionMenu(root, variable2, *CurrenyCode_list)
      
    FromCurrency_option.grid(row = 2, column = 1, ipadx = 10)
    ToCurrency_option.grid(row = 3, column = 1, ipadx = 10)
      
    # Create a Convert Button and attached 
    # with RealTimeCurrencyExchangeRate function 
    button1 = Button(root, text = "Convert", bg = "red", fg = "black",
                                command = RealTimeCurrencyConversion)
      
    button1.grid(row = 4, column = 1)
  
    # Create a Clear Button and attached 
    # with delete function 
    button2 = Button(root, text = "Clear", bg = "red"
                     fg = "black", command = clear_all)
    button2.grid(row = 6, column = 1)
    
    # Start the GUI 
    root.mainloop() 

Output :
output1
output2

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