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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 _resolve_version(version):
 """ Resolve LATEST version """

    if version is not LATEST:
        return version

    resp = urlopen('https://pypi.python.org/pypi/setuptools/json')
    with contextlib.closing(resp):
        try:
            charset = resp.info().get_content_charset()
        except Exception:
            # Python 2 compat; assume UTF-8
            charset = 'UTF-8'
        reader = codecs.getreader(charset)
        doc = json.load(reader(resp))

    return str(doc['info']['version'])