1 英里大约等于 1.609 千米

def print_menu():print('1. Kilometers to Miles')print('2. Miles to kilometers')def km_miles():km = float(input('Enter distance in kilometers: '))miles = km / 1.609print('Distance in miles: {0}'.format(miles))def miles_km():miles = float(input('Enter distance in miles: '))km = miles * 1.609print('Distance in kilometers: {0}'.format(km))if __name__ == '__main__':print_menu()choice = input('Which conversion would you like to do?:')if choice == '1':km_miles()if choice == '2':miles_km()