'Returns and prints time elapsed since last tic().'

def toc(self):

    import time
    if (self.start is None):
        raise Exception('toc()    without    tic()')
    t = time.time()
    self.last = t
    elapsed = (t - self.start)
    print 'TOC:    Elapsed:    {}    seconds.'.format(elapsed)
    return elapsed
