gistfile1.txt

def read_file(file_name: str, key_name='') -> list:
    """
    Open and read csv.gz, .tsv, .csv, or JSON file; return as list

    :param file_name: Name of file
    :param key_name: Name of JSON key (optional)

    :return: data_list: Data in list form
    """

    # Determine whether file is of type csv, gz, tsv, csv, or JSON
    if file_name[-6:] == 'csv.gz':
        data_file = gzip.open(file_name, mode='rt')
        data_list = csv_list_maker(data_file)

    elif file_name[-3:] == 'tsv':
        data_file = open(file_name, newline="")
        data_list = csv_list_maker(data_file, delimiter="\t")

    elif file_name[-3] == 'csv':
        data_file = open(file_name)
        data_list = csv_list_maker(data_file)

    elif file_name[-4:] == 'json':
        with open(file_name, 'r') as read_file:
            data_file = json.load(read_file)
            data_list = []
            for item in range(len(data_file)):
                data_list.append(data_file[item][key_name])
    else:
        print('Unusable file type. Please submit file of type csv.gz, .csv, .tsv, or JSON')
        return []

    return data_list