def _find_second(str, char="["):
    """Returns index of second occurrence of char in line
    
    Arguments:
        str str -- string to look in (default: "[")

    Keyword Arguments:
        char str -- char to look the second occurrence of

    Returns:
        int -- index of second occurrence
    """
    start = str.find(char)
    return str.find(char, start + 1) + 1