计算函数耗时多久

time_cost.py

def time_cost(f):
    """
    :param f: function
    :return: 计算函数耗时多久
    """
    def _wrapper(*args, **kwargs):
        now = time.time()
        res = f(*args, **kwargs)
        log_txt = u'函数 %s 耗时 %.2fs!' % (f.__name__, time.time() - now)
        _logger.info(log_txt)
        print log_txt
        return res
    return _wrapper