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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 normaliseURL(url):
 """Normalising - strips and leading or trailing whitespace, - replaces HTML entities and character references, - removes any leading empty segments to avoid breaking urllib2. """

    url = unicode_safe(url).strip()
    # XXX: brutal hack
    url = unescape(url)

    pu = list(urlparse(url))
    segments = pu[2].split('/')
    while segments and segments[0] in ('', '..'):
        del segments[0]
    pu[2] = '/' + '/'.join(segments)
    # remove leading '&' from query
    if pu[4].startswith('&'):
        pu[4] = pu[4][1:]
    # remove anchor
    pu[5] = ""
    return urlunparse(pu)