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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 enable_memcache(source=None, release=None, package=None):
 """Determine if memcache should be enabled on the local unit @param release: release of OpenStack currently deployed @param package: package to derive OpenStack version deployed @returns boolean Whether memcache should be enabled """

    _release = None
    if release:
        _release = release
    else:
        _release = os_release(package, base='icehouse')
    if not _release:
        _release = get_os_codename_install_source(source)

    return CompareOpenStackReleases(_release) >= 'mitaka'