Currency Converter in Python

Python is a very versatile programming language. Python is being used in almost each mainstream technology and one can develop literally any application with it. Let’s see a Python program to convert the currency of one country to that of another country. To use this service, one must need the API key, which can be get from here. We will use fixer API to get the live conversion rates and convert the corresponding amount.

Case 1

Modules needed:

1.1: requests: This module does not build in with python. To install it type the below command in the terminal or cmd.

pip install requests

Below is the implementation: 

Python3

# Python program to convert the currency
# of one country to that of another country

# Import the modules needed
import requests

class Currency_convertor:
    # empty dict to store the conversion rates
    rates = {}
    def __init__(self, url):
        data = requests.get(url).json()

        # Extracting only the rates from the json data
        self.rates = data["rates"]

    # function to do a simple cross multiplication between
    # the amount and the conversion rates
    def convert(self, from_currency, to_currency, amount):
        initial_amount = amount
        if from_currency != 'EUR' :
            amount = amount / self.rates[from_currency]

        # limiting the precision to 2 decimal places
        amount = round(amount * self.rates[to_currency], 2)
        print('{} {} = {} {}'.format(initial_amount, from_currency, amount, to_currency))

# Driver code
if __name__ == "__main__":

    # YOUR_ACCESS_KEY = 'GET YOUR ACCESS KEY FROM fixer.io'
    url = str.__add__('http://data.fixer.io/api/latest?access_key=', YOUR_ACCESS_KEY)
    c = Currency_convertor(url)
    from_country = input("From Country: ")
    to_country = input("TO Country: ")
    amount = int(input("Amount: "))

    c.convert(from_country, to_country, amount)

Input : 

From Country: USD 
TO Country: INR 
Amount: 1 

Output :

1 USD = 70.69 INR

Case 2

Modules needed:

2.1: tkinter: It facilities  Graphical User interfaces (GUIs).

pip install tkinter

2.2: forex_python:  It is a Free Foreign exchange rate and currency conversion library.

pip install forex_python

Implementation: 

Python

#pip install tkinter
import tkinter as tk
from tkinter import *
import tkinter.messagebox
#GUI
root = tk.Tk()

root.title("Currency converter:GeeksForGeeks")

Tops = Frame(root, bg = '#e6e5e5', pady=2, width=1850, height=100, relief="ridge")
Tops.grid(row=0, column=0)

headlabel = tk.Label(Tops, font=('lato black', 19, 'bold'), text='Currency converter :GeeksForGeeks ',
                    bg='#e6e5e5', fg='black')
headlabel.grid(row=1, column=0, sticky=W)

variable1 = tk.StringVar(root)
variable2 = tk.StringVar(root)

variable1.set("currency")
variable2.set("currency")
#Function To For Real Time Currency Conversion

def RealTimeCurrencyConversion():
    from forex_python.converter import CurrencyRates
    c = CurrencyRates()

    from_currency = variable1.get()
    to_currency = variable2.get()

    if (Amount1_field.get() == ""):
        tkinter.messagebox.showinfo("Error !!", "Amount Not Entered.\n Please a valid amount.")

    elif (from_currency == "currency" or to_currency == "currency"):
        tkinter.messagebox.showinfo("Error !!",
                                    "Currency Not Selected.\n Please select FROM and TO Currency form menu.")

    else:
        new_amt = c.convert(from_currency, to_currency, float(Amount1_field.get()))
        new_amount = float("{:.4f}".format(new_amt))
        Amount2_field.insert(0, str(new_amount))

#clearing all the data entered by the user
def clear_all():
    Amount1_field.delete(0, tk.END)
    Amount2_field.delete(0, tk.END)


CurrenyCode_list = ["INR", "USD", "CAD", "CNY", "DKK", "EUR"]

root.configure(background='#e6e5e5')
root.geometry("700x400")

Label_1 = Label(root, font=('lato black', 27, 'bold'), text="", padx=2, pady=2, bg="#e6e5e5", fg="black")
Label_1.grid(row=1, column=0, sticky=W)

label1 = tk.Label(root, font=('lato black', 15, 'bold'), text="\t    Amount  :  ", bg="#e6e5e5", fg="black")
label1.grid(row=2, column=0, sticky=W)

label1 = tk.Label(root, font=('lato black', 15, 'bold'), text="\t    From Currency  :  ", bg="#e6e5e5", fg="black")
label1.grid(row=3, column=0, sticky=W)

label1 = tk.Label(root, font=('lato black', 15, 'bold'), text="\t    To Currency  :  ", bg="#e6e5e5", fg="black")
label1.grid(row=4, column=0, sticky=W)

label1 = tk.Label(root, font=('lato black', 15, 'bold'), text="\t    Converted Amount  :  ", bg="#e6e5e5", fg="black")
label1.grid(row=8, column=0, sticky=W)

Label_1 = Label(root, font=('lato black', 7, 'bold'), text="", padx=2, pady=2, bg="#e6e5e5", fg="black")
Label_1.grid(row=5, column=0, sticky=W)

Label_1 = Label(root, font=('lato black', 7, 'bold'), text="", padx=2, pady=2, bg="#e6e5e5", fg="black")
Label_1.grid(row=7, column=0, sticky=W)

FromCurrency_option = tk.OptionMenu(root, variable1, *CurrenyCode_list)
ToCurrency_option = tk.OptionMenu(root, variable2, *CurrenyCode_list)

FromCurrency_option.grid(row=3, column=0, ipadx=45, sticky=E)
ToCurrency_option.grid(row=4, column=0, ipadx=45, sticky=E)

Amount1_field = tk.Entry(root)
Amount1_field.grid(row=2, column=0, ipadx=28, sticky=E)

Amount2_field = tk.Entry(root)
Amount2_field.grid(row=8, column=0, ipadx=31, sticky=E)

Label_9 = Button(root, font=('arial', 15, 'bold'), text="   Convert  ", padx=2, pady=2, bg="lightblue", fg="white",
                 command=RealTimeCurrencyConversion)
Label_9.grid(row=6, column=0)

Label_1 = Label(root, font=('lato black', 7, 'bold'), text="", padx=2, pady=2, bg="#e6e5e5", fg="black")
Label_1.grid(row=9, column=0, sticky=W)

Label_9 = Button(root, font=('arial', 15, 'bold'), text="   Clear All  ", padx=2, pady=2, bg="lightblue", fg="white",
                 command=clear_all)
Label_9.grid(row=10, column=0)


root.mainloop()

Output: