def METHOD_NAME(package, conn=None):
    """
    List files for an installed package
    """
    close = False
    if conn is None:
        close = True
        conn = init()
    data = conn.execute("SELECT package FROM packages WHERE package=?", (package,))
    if not data.fetchone():
        if close:
            conn.close()
        return None
    ret = []
    data = conn.execute("SELECT path, sum FROM files WHERE package=?", (package,))
    for file_ in data.fetchall():
        ret.append(file_)
    if close:
        conn.close()
    return ret