def mkdir (path, mode=0777):
    """Create a directory, but report no error if it already exists.
    
    This is the same as os.mkdir except it doesn't complain if the directory
    already exists.  It works by calling os.mkdir.  In the event of an error,
    it checks if the requested path is a directory and suppresses the error
    if so.
    """
    try:
        os.mkdir (path, mode)
    except OSError:
        if not os.path.isdir (path):
            raise

def makedirs (path, mode=0777):
    """Create a directory recursively, reporting no error if it already exists.
    
    This is like os.makedirs except it doesn't complain if the specified
    directory or any of its ancestors already exist.  This works by
    essentially re-implementing os.makedirs but calling the mkdir in this
    module instead of os.mkdir.  This also corrects a race condition in
    os.makedirs.
    """
    if not os.path.isdir (path):
        head, tail = os.path.split (path)
        if not tail:
            head, tail = os.path.split (head)
        if head and tail:
            makedirs (head, mode)
        mkdir (path, mode)