SyntaxError：％time pickle.dump

Question

有人可以向我解释％时间是如何运作的吗？ 我从一本书中得到了这个，但每次使用它时，都会出错。 SyntaxError：语法无效

path = '/home/foad/PythonBoken/flash/'

import numpy as np
from random import gauss

a = [gauss(1.5, 2) for i in range(100000)] #generation of normally distributed randoms

#Write this list above to disk for later retrieval
import pickle 

pkl_file=open(path + 'data.pkl', 'w') #open file for writing. Existing file may be overwritten

%time pickle.dump(a, pkl_file)