# SAMPLE
data = {
    "Sara": ["C", "brainfuck"],
    "Chad": ["HTML"],
    "Anon": None,
}


def _get_persons_favorite_language_as_human_readable_string(person, languages=None):

    STRING_TEMPLATES = {
        "singular":  "{person}'s favorite language is {language}",
        "plural": "{person}'s favorite languages are {language}",
        "retarded": "{person} is just mildly retarded",
    }
    if not languages:
        result_template = STRING_TEMPLATES["retarded"]
    elif len(languages) == 1:
        result_template = STRING_TEMPLATES["singular"]
    else:
        result_template = STRING_TEMPLATES["plural"]

    languages = _stringify_list(languages)
    return result_template.format(person=person, language=languages)


def _stringify_list(a_list):
    if not a_list:
        a_list = []
    a_list = ", ".join(a_list)
    return a_list


def print_persons_favorite_languages(data):
    for person, languages in data.items():
        readable_string = _get_persons_favorite_language_as_human_readable_string(
            person,
            languages,
        )
        print(readable_string)