human
Give me a the Python code you requested given the following:
Complete the below
def _network(t=None, url='http://google.com'):

    ''''Decorator that will skip a test if `url` is unreachable.
    Parameters
    t : function, optional
    url : str, optional'
    '''
assistant
#Here is the Python code you requested.
    import nose
    if (t is None):
        return (lambda x: _network(x, url=url))
    def wrapper(*args, **kwargs):
        try:
            f = urlopen(url)
        except (IOError, HTTPException):
            raise nose.SkipTest()
        else:
            f.close()
            return t(*args, **kwargs)
    return wrapper