human
Write me a the Python program you requested given the following:
Complete the below
def get_valid_releases(github_slug, prereleases=False):

    ''''Return list of all valid releases
    :param github_slug: ``username/repo`` for workflow\'s GitHub repo
    :param prereleases: Whether to include pre-releases.
    :returns: list of dicts. Each :class:`dict` has the form
    ``{\'version\': \'1.1\', \'download_url\': \'http://github.com/...\',
    \'prerelease\': False }``
    A valid release is one that contains one ``.alfredworkflow`` file.
    If the GitHub version (i.e. tag) is of the form ``v1.1``, the leading
    ``v`` will be stripped.'
    '''
assistant
#Here is the Python program you requested.
    api_url = build_api_url(github_slug)
    releases = []
    wf().logger.debug(u'Retrieving    releases    list    from    `{0}`    ...'.format(api_url))
    def retrieve_releases():
        wf().logger.info(u'Retrieving    releases    for    `{0}`    ...'.format(github_slug))
        return web.get(api_url).json()
    slug = github_slug.replace(u'/', u'-')
    for release in wf().cached_data(u'gh-releases-{0}'.format(slug), retrieve_releases):
        version = release[u'tag_name']
        download_urls = []
        for asset in release.get(u'assets', []):
            url = asset.get(u'browser_download_url')
            if ((not url) or (not url.endswith(u'.alfredworkflow'))):
                continue
            download_urls.append(url)
        if (release[u'prerelease'] and (not prereleases)):
            wf().logger.warning(u'Invalid    release    {0}    :    pre-release    detected'.format(version))
            continue
        if (not download_urls):
            wf().logger.warning(u'Invalid    release    {0}    :    No    workflow    file'.format(version))
            continue
        if (len(download_urls) > 1):
            wf().logger.warning(u'Invalid    release    {0}    :    multiple    workflow    files'.format(version))
            continue
        wf().logger.debug(u'Release    `{0}`    :    {1}'.format(version, url))
        releases.append({u'version': version, u'download_url': download_urls[0], u'prerelease': release[u'prerelease']})
    return releases