from os import system print('1. Ping Google') print('2. Ping Yahoo') print('3. Ping custom URL') while True:     key = int(input('Input your choice: '))     if key == 1:             system("ping www.google.com")     elif key == 2:             system("ping www.yahoo.com")     elif key == 3:             url = input('Enter URL: ')             system("ping " + url)     else:             print("Invalid Option!")

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