Currency Converter in python

python/currency-converter-project.py

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+# # Python Project on Currency Converter
+
+import requests
+from tkinter import *
+import tkinter as tk
+from tkinter import ttk
+
+
+class RealTimeCurrencyConverter():
+    def __init__(self,url):
+            self.data = requests.get(url).json()
+            self.currencies = self.data['rates']
+
+    def convert(self, from_currency, to_currency, amount): 
+        initial_amount = amount 
+        if from_currency != 'USD' : 
+            amount = amount / self.currencies[from_currency] 
+
+        # limiting the precision to 4 decimal places 
+        amount = round(amount * self.currencies[to_currency], 4) 
+        return amount
+
+class App(tk.Tk):
+
+    def __init__(self, converter):
+        tk.Tk.__init__(self)
+        self.title = 'Currency Converter'
+        self.currency_converter = converter
+
+        #self.configure(background = 'blue')
+        self.geometry("500x200")
+
+        # Label
+        self.intro_label = Label(self, text = 'Welcome to Real Time Currency Convertor',  fg = 'blue', relief = tk.RAISED, borderwidth = 3)
+        self.intro_label.config(font = ('Courier',15,'bold'))
+
+        self.date_label = Label(self, text = f"1 Indian Rupee equals = {self.currency_converter.convert('INR','USD',1)} USD \n Date : {self.currency_converter.data['date']}", relief = tk.GROOVE, borderwidth = 5)
+
+        self.intro_label.place(x = 10 , y = 5)
+        self.date_label.place(x = 160, y= 50)
+
+        # Entry box
+        valid = (self.register(self.restrictNumberOnly), '%d', '%P')
+        self.amount_field = Entry(self,bd = 3, relief = tk.RIDGE, justify = tk.CENTER,validate='key', validatecommand=valid)
+        self.converted_amount_field_label = Label(self, text = '', fg = 'black', bg = 'white', relief = tk.RIDGE, justify = tk.CENTER, width = 17, borderwidth = 3)
+
+        # dropdown
+        self.from_currency_variable = StringVar(self)
+        self.from_currency_variable.set("INR") # default value
+        self.to_currency_variable = StringVar(self)
+        self.to_currency_variable.set("USD") # default value
+
+        font = ("Courier", 12, "bold")
+        self.option_add('*TCombobox*Listbox.font', font)
+        self.from_currency_dropdown = ttk.Combobox(self, textvariable=self.from_currency_variable,values=list(self.currency_converter.currencies.keys()), font = font, state = 'readonly', width = 12, justify = tk.CENTER)
+        self.to_currency_dropdown = ttk.Combobox(self, textvariable=self.to_currency_variable,values=list(self.currency_converter.currencies.keys()), font = font, state = 'readonly', width = 12, justify = tk.CENTER)
+
+        # placing
+        self.from_currency_dropdown.place(x = 30, y= 120)
+        self.amount_field.place(x = 36, y = 150)
+        self.to_currency_dropdown.place(x = 340, y= 120)
+        #self.converted_amount_field.place(x = 346, y = 150)
+        self.converted_amount_field_label.place(x = 346, y = 150)
+
+        # Convert button
+        self.convert_button = Button(self, text = "Convert", fg = "black", command = self.perform) 
+        self.convert_button.config(font=('Courier', 10, 'bold'))
+        self.convert_button.place(x = 225, y = 135)
+
+    def perform(self):
+        amount = float(self.amount_field.get())
+        from_curr = self.from_currency_variable.get()
+        to_curr = self.to_currency_variable.get()
+
+        converted_amount = self.currency_converter.convert(from_curr,to_curr,amount)
+        converted_amount = round(converted_amount, 2)
+
+        self.converted_amount_field_label.config(text = str(converted_amount))
+
+    def restrictNumberOnly(self, action, string):
+        regex = re.compile(r"[0-9,]*?(\.)?[0-9,]*$")
+        result = regex.match(string)
+        return (string == "" or (string.count('.') <= 1 and result is not None))
+
+if __name__ == '__main__':
+    url = 'https://api.exchangerate-api.com/v4/latest/USD'
+    converter = RealTimeCurrencyConverter(url)
+
+    App(converter)
+    mainloop()
+