How to use the blosc.clib_versions.keys function in blosc

def print_versions():
    """Print all the versions of software that python-blosc relies on."""
    import platform
    print("-=" * 38)
    print("python-blosc version: %s" % blosc.__version__)
    print("Blosc version: %s" % blosc.blosclib_version)
    print("Compressors available: %s" % blosc.cnames)
    print("Compressor library versions:")
    for clib in sorted(blosc.clib_versions.keys()):
        print("  %s: %s" % (clib, blosc.clib_versions[clib]))
    print("Python version: %s" % sys.version)
    (sysname, nodename, release, version, machine, processor) = platform.uname()
    print("Platform: %s-%s-%s (%s)" % (sysname, release, machine, version))
    if sysname == "Linux":
        distro = os_release_pretty_name()
        if distro:
            print("Linux dist:", distro)
    if not processor:
        processor = "not recognized"
    print("Processor: %s" % processor)
    print("Byte-ordering: %s" % sys.byteorder)
    print("Detected cores: %s" % blosc.ncores)
    print("Number of threads to use by default: %s" % blosc.nthreads)
    print("-=" * 38)