Script to print all Unicode flag emoji which are also a valid flag when reversed. - Python Pastebin

"""
Script to print all Unicode flag emoji which are also a valid flag when reversed.

Output of this script:

🇦🇬 (Antigua and Barbuda) reverses to 🇬🇦 (Gabon)
🇦🇱 (Albania) reverses to 🇱🇦 (Lao People's Democratic Republic)
🇦🇲 (Armenia) reverses to 🇲🇦 (Morocco)
🇦🇶 (Antarctica) reverses to 🇶🇦 (Qatar)
🇦🇸 (American Samoa) reverses to 🇸🇦 (Saudi Arabia)
🇦🇺 (Australia) reverses to 🇺🇦 (Ukraine)
🇦🇿 (Azerbaijan) reverses to 🇿🇦 (South Africa)
🇧🇧 (Barbados) reverses to 🇧🇧 (Barbados)
🇧🇬 (Bulgaria) reverses to 🇬🇧 (United Kingdom)
🇧🇱 (Saint Barthélemy) reverses to 🇱🇧 (Lebanon)
🇧🇸 (Bahamas) reverses to 🇸🇧 (Solomon Islands)
🇨🇨 (Cocos (Keeling) Islands) reverses to 🇨🇨 (Cocos (Keeling) Islands)
🇨🇱 (Chile) reverses to 🇱🇨 (Saint Lucia)
🇨🇲 (Cameroon) reverses to 🇲🇨 (Monaco)
🇨🇳 (China) reverses to 🇳🇨 (New Caledonia)
🇨🇻 (Cape Verde) reverses to 🇻🇨 (Saint Vincent and the Grenadines)
🇩🇲 (Dominica) reverses to 🇲🇩 (Moldova, Republic of)
🇪🇪 (Estonia) reverses to 🇪🇪 (Estonia)
🇪🇬 (Egypt) reverses to 🇬🇪 (Georgia)
🇪🇷 (Eritrea) reverses to 🇷🇪 (Réunion)
🇪🇸 (Spain) reverses to 🇸🇪 (Sweden)
🇫🇲 (Micronesia, Federated States of) reverses to 🇲🇫 (Saint Martin (French part))
🇬🇦 (Gabon) reverses to 🇦🇬 (Antigua and Barbuda)
🇬🇧 (United Kingdom) reverses to 🇧🇬 (Bulgaria)
🇬🇪 (Georgia) reverses to 🇪🇬 (Egypt)
🇬🇬 (Guernsey) reverses to 🇬🇬 (Guernsey)
🇬🇲 (Gambia) reverses to 🇲🇬 (Madagascar)
🇬🇳 (Guinea) reverses to 🇳🇬 (Nigeria)
🇬🇵 (Guadeloupe) reverses to 🇵🇬 (Papua New Guinea)
🇬🇸 (South Georgia and the South Sandwich Islands) reverses to 🇸🇬 (Singapore)
🇬🇹 (Guatemala) reverses to 🇹🇬 (Togo)
🇬🇺 (Guam) reverses to 🇺🇬 (Uganda)
🇭🇰 (Hong Kong) reverses to 🇰🇭 (Cambodia)
🇭🇲 (Heard Island and McDonald Islands) reverses to 🇲🇭 (Marshall Islands)
🇭🇹 (Haiti) reverses to 🇹🇭 (Thailand)
🇮🇱 (Israel) reverses to 🇱🇮 (Liechtenstein)
🇮🇳 (India) reverses to 🇳🇮 (Nicaragua)
🇮🇸 (Iceland) reverses to 🇸🇮 (Slovenia)
🇰🇭 (Cambodia) reverses to 🇭🇰 (Hong Kong)
🇰🇲 (Comoros) reverses to 🇲🇰 (Macedonia, the Former Yugoslav Republic of)
🇰🇵 (Korea, Democratic People's Republic of) reverses to 🇵🇰 (Pakistan)
🇱🇦 (Lao People's Democratic Republic) reverses to 🇦🇱 (Albania)
🇱🇧 (Lebanon) reverses to 🇧🇱 (Saint Barthélemy)
🇱🇨 (Saint Lucia) reverses to 🇨🇱 (Chile)
🇱🇮 (Liechtenstein) reverses to 🇮🇱 (Israel)
🇱🇸 (Lesotho) reverses to 🇸🇱 (Sierra Leone)
🇱🇹 (Lithuania) reverses to 🇹🇱 (Timor-Leste)
🇲🇦 (Morocco) reverses to 🇦🇲 (Armenia)
🇲🇨 (Monaco) reverses to 🇨🇲 (Cameroon)
🇲🇩 (Moldova, Republic of) reverses to 🇩🇲 (Dominica)
🇲🇫 (Saint Martin (French part)) reverses to 🇫🇲 (Micronesia, Federated States of)
🇲🇬 (Madagascar) reverses to 🇬🇲 (Gambia)
🇲🇭 (Marshall Islands) reverses to 🇭🇲 (Heard Island and McDonald Islands)
🇲🇰 (Macedonia, the Former Yugoslav Republic of) reverses to 🇰🇲 (Comoros)
🇲🇲 (Myanmar) reverses to 🇲🇲 (Myanmar)
🇲🇴 (Macao) reverses to 🇴🇲 (Oman)
🇲🇵 (Northern Mariana Islands) reverses to 🇵🇲 (Saint Pierre and Miquelon)
🇲🇸 (Montserrat) reverses to 🇸🇲 (San Marino)
🇲🇹 (Malta) reverses to 🇹🇲 (Turkmenistan)
🇲🇺 (Mauritius) reverses to 🇺🇲 (United States Minor Outlying Islands)
🇲🇿 (Mozambique) reverses to 🇿🇲 (Zambia)
🇳🇨 (New Caledonia) reverses to 🇨🇳 (China)
🇳🇬 (Nigeria) reverses to 🇬🇳 (Guinea)
🇳🇮 (Nicaragua) reverses to 🇮🇳 (India)
🇳🇵 (Nepal) reverses to 🇵🇳 (Pitcairn)
🇴🇲 (Oman) reverses to 🇲🇴 (Macao)
🇵🇬 (Papua New Guinea) reverses to 🇬🇵 Guadeloupe)
🇵🇰 (Pakistan) reverses to 🇰🇵 (Korea, Democratic People's Republic of)
🇵🇲 (Saint Pierre and Miquelon) reverses to 🇲🇵 (Northern Mariana Islands)
🇵🇳 (Pitcairn) reverses to 🇳🇵 (Nepal)
🇶🇦 (Qatar) reverses to 🇦🇶 (Antarctica)
🇷🇪 (Réunion) reverses to 🇪🇷 (Eritrea)
🇷🇸 (Serbia) reverses to 🇸🇷 (Suriname)
🇸🇦 (Saudi Arabia) reverses to 🇦🇸 (American Samoa)
🇸🇧 (Solomon Islands) reverses to 🇧🇸 (Bahamas)
🇸🇪 (Sweden) reverses to 🇪🇸 (Spain)
🇸🇬 (Singapore) reverses to 🇬🇸 (South Georgia and the South Sandwich Islands)
🇸🇮 (Slovenia) reverses to 🇮🇸 (Iceland)
🇸🇱 (Sierra Leone) reverses to 🇱🇸 (Lesotho)
🇸🇲 (San Marino) reverses to 🇲🇸 (Montserrat)
🇸🇷 (Suriname) reverses to 🇷🇸 (Serbia)
🇸🇸 (South Sudan) reverses to 🇸🇸 (South Sudan)
🇹🇬 (Togo) reverses to 🇬🇹 (Guatemala)
🇹🇭 (Thailand) reverses to 🇭🇹 (Haiti)
🇹🇱 (Timor-Leste) reverses to 🇱🇹 (Lithuania)
🇹🇲 (Turkmenistan) reverses to 🇲🇹 (Malta)
🇹🇹 (Trinidad and Tobago) reverses to 🇹🇹 (Trinidad and Tobago)
🇺🇦 (Ukraine) reverses to 🇦🇺 (Australia)
🇺🇬 (Uganda) reverses to 🇬🇺 (Guam)
🇺🇲 (United States Minor Outlying Islands) reverses to 🇲🇺 (Mauritius)
🇻🇨 (Saint Vincent and the Grenadines) reverses to 🇨🇻 (Cape Verde)
🇿🇦 (South Africa) reverses to 🇦🇿 (Azerbaijan)
🇿🇲 (Zambia) reverses to 🇲🇿 (Mozambique)
"""
import json
from urllib.request import urlopen
import unicodedata


# JSON list of ISO 3166-1-alpha-2 data
country_data_url = "https://www.datahub.io/core/country-list/r/data.json"
country_data = json.loads(urlopen(country_data_url).read().decode())


# Map country codes to country names
countries = {country["Code"]: country["Name"] for country in country_data}


# Find all country codes that are valid when reversed
reversible_codes = sorted(code for code in countries if code[::-1] in countries)


def flag_for(code):
    """Return unicode flag emoji given a 2-digit country code."""
    return "".join(
        unicodedata.lookup(f"REGIONAL INDICATOR SYMBOL LETTER {char}") for char in code
    )


# Print each flag and country name and its valid reverse flag and country name
# Note: some flags are their own reverse (due to palindrome codes like TT)
# Note: each countries is printed twice (once as forward, once as reverse)
for code in reversible_codes:
    print(
        f"{flag_for(code)} ({countries[code]})",
        "reverses to",
        f"{flag_for(code[::-1])} ({countries[code[::-1]]})",
    )
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