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Tkinter is Python’s standard library for creating graphical user interfaces (GUIs). A currency conversion application can be developed using Tkinter by combining widgets such as labels, an entry box, a drop-down menu, a button, and a result display area. For this application, it is assumed that the user enters an amount in a fixed base currency, such as Indian Rupees (INR), and selects a target currency such as US Dollar (USD), Euro (EUR), British Pound (GBP), or Japanese Yen (JPY). The application uses predefined exchange rates for demonstration purposes. In a real-world application, these rates could be obtained dynamically from a currency-exchange API. The main objective is to create an interactive interface in which the user enters an amount, selects a target currency, clicks the conversion button, and immediately receives the converted value. The result label remains visible after conversion, thereby providing a persistent display of the calculated result. The following Python program implements the required currency converter: ```python import tkinter as tk from tkinter import ttk, messagebox # Predefined exchange rates relative to 1 INR exchange_rates = { "USD": 0.012, "EUR": 0.011, "GBP": 0.0095, "JPY": 1.75, "AUD": 0.018 } # Function to perform currency conversion def convert_currency(): try: amount = float(amount_entry.get()) if amount < 0: messagebox.showerror("Invalid Amount", "Please enter a positive amount.") return target_currency = currency_var.get() if target_currency not in exchange_rates: messagebox.showerror("Invalid Currency", "Please select a target currency.") return rate = exchange_rates[target_currency] converted_amount = amount * rate result_label.config( text=f"{amount:.2f} INR = {converted_amount:.2f} {target_currency}" ) except ValueError: messagebox.showerror( "Invalid Input", "Please enter a valid numerical amount." ) # Create main window root = tk.Tk() root.title("Currency Converter") root.geometry("450x300") root.resizable(False, False) # Heading title_label = tk.Label( root, text="Currency Converter", font=("Arial", 20, "bold") ) title_label.pack(pady=20) # Amount label amount_label = tk.Label( root, text="Enter Amount (INR):", font=("Arial", 12) ) amount_label.pack(pady=5) # Amount input box amount_entry = tk.Entry( root, width=25, font=("Arial", 12) ) amount_entry.pack(pady=5) # Currency selection label currency_label ________ __________ _______ ___ ___ ______ _______.
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