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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def diskusage(path):
    '''
    Recursively calculate disk usage of path and return it
    in bytes

    CLI Example:

    .. code-block:: bash

        salt '*' file.diskusage /path/to/check
    '''

    total_size = 0
    seen = set()
    if os.path.isfile(path):
        stat_structure = os.stat(path)
        ret = stat_structure.st_size
        return ret

    for dirpath, dirnames, filenames in salt.utils.path.os_walk(path):
        for f in filenames:
            fp = os.path.join(dirpath, f)

            try:
                stat_structure = os.stat(fp)
            except OSError:
                continue

            if stat_structure.st_ino in seen:
                continue

            seen.add(stat_structure.st_ino)

            total_size += stat_structure.st_size

    ret = total_size
    return ret