How to use the blosc.blosc_extension function in blosc

def compressor_list():
    """
    compressor_list()

    Returns a list of compressors available in C library.

    Parameters
    ----------
    None

    Returns
    -------
    out : list
        The list of names.
    """
    return _ext.compressor_list().split(',')

"""
    name_to_code(name)

    Return the compressor code of a compressor name.

    Parameters
    ----------
    name : str
        The compressor name.

    Returns
    -------
    out : int
        The compressor code.
    """
    return _ext.name_to_code(name)

-----
    The number of threads for Blosc is the maximum number of cores
    detected on your machine (via `detect_number_of_cores`).  In some
    cases Blosc gets better results if you set the number of threads
    to a value slightly below than your number of cores.

    Examples
    --------
    Set the number of threads to 2 and then to 1:

    >>> oldn = set_nthreads(2)
    >>> set_nthreads(1)
    2

    """
    if nthreads > _ext.BLOSC_MAX_THREADS:
        raise ValueError("the number of threads cannot be larger than %d" % \
                         _ext.BLOSC_MAX_THREADS)

    return _ext.set_nthreads(nthreads)