countries.py

# List of countries
countries = ["Afghanistan", "Albania", "Algeria", "Andorra", "Angola", "Antigua and Barbuda", "Argentina", "Armenia", "Australia", "Austria", "Azerbaijan", 
             "Bahamas", "Bahrain", "Bangladesh", "Barbados", "Belarus", "Belgium", "Belize", "Benin", "Bhutan", "Bolivia", "Bosnia and Herzegovina", "Botswana", "Brazil", "Brunei", "Bulgaria", "Burkina Faso", "Burundi", 
             "Cabo Verde", "Cambodia", "Cameroon", "Canada", "Central African Republic", "Chad", "Chile", "China", "Colombia", "Comoros", "Congo (Brazzaville)", "Congo (Kinshasa)", "Costa Rica", "Cote d'Ivoire", "Croatia", "Cuba", "Cyprus", "Czech Republic", 
             "Denmark", "Djibouti", "Dominica", "Dominican Republic", 
             "East Timor", "Ecuador", "Egypt", "El Salvador", "Equatorial Guinea", "Eritrea", "Estonia", "Ethiopia", 
             "Fiji", "Finland", "France", 
             "Gabon", "Gambia", "Georgia", "Germany", "Ghana", "Greece", "Grenada", "Guatemala", "Guinea", "Guinea-Bissau", "Guyana", 
             "Haiti", "Honduras", "Hungary", 
             "Iceland", "India", "Indonesia", "Iran", "Iraq", "Ireland", "Israel", "Italy", 
             "Jamaica", "Japan", "Jordan", 
             "Kazakhstan", "Kenya", "Kiribati", "Korea, North", "Korea, South", "Kuwait", "Kyrgyzstan", 
             "Laos", "Latvia", "Lebanon", "Lesotho", "Liberia", "Libya", "Liechtenstein", "Lithuania", "Luxembourg", 
             "North Macedonia", "Madagascar", "Malawi", "Malaysia", "Maldives", "Mali", "Malta", "Marshall Islands", "Mauritania", "Mauritius", "Mexico", "Micronesia", "Moldova", "Monaco", "Mongolia", "Montenegro", "Morocco", "Mozambique", "Myanmar", 
             "Namibia", "Nauru", "Nepal", "Netherlands", "New Zealand", "Nicaragua", "Niger", "Nigeria", "Norway", 
             "Oman", 
             "Pakistan", "Palau", "Panama", "Papua New Guinea", "Paraguay", "Peru", "Philippines", "Poland", "Portugal", 
             "Qatar", 
             "Romania", "Russia", "Rwanda", 
             "Saint Kitts and Nevis", "Saint Lucia", "Saint Vincent and the Grenadines", "Samoa", "San Marino", "Sao Tome and Principe", "Saudi Arabia", "Senegal", "Serbia", "Seychelles", "Sierra Leone", "Singapore", "Slovakia", "Slovenia", "Solomon Islands", "Somalia", "South Africa", "Spain", "Sri Lanka", "Sudan", "Suriname", "Swaziland", "Sweden", "Switzerland", "Syria",
             "Taiwan", "Tajikistan", "Tanzania", "Thailand", "Timor-Leste", "Togo", "Tonga", "Trinidad and Tobago", "Tunisia", "Turkey", "Turkmenistan", "Tuvalu",
             "Uganda", "Ukraine", "United Arab Emirates", "United Kingdom", "United States", "Uruguay", "Uzbekistan", 
             "Vanuatu", "Vatican City (Holy See)", "Venezuela", "Vietnam", 
             "Yemen", 
             "Zambia", "Zimbabwe"
             ] 
filter_letter = input("Do you want to filter countries by starting letter? (y/n/q): ")
while filter_letter.lower() != 'quit':
    if filter_letter.lower() == 'y':
        letter = input("Enter the letter to filter by: ")
        filtered_countries = [country for country in countries if country.startswith(letter.upper())]
        print(f"Countries starting with '{letter.upper()}':")
        print(filtered_countries)
    elif filter_letter.lower() == 'n':
        print("All countries:")
        print(countries) 
    else:
        print("Invalid input. Please enter 'y' to filter by letter, 'n' to show all countries, or 'quit' to quit.")
    filter_letter = input("Do you want to filter countries by starting letter or quit? (y/n/quit): ")