python Jupyter运行时间实例过程解析

import time
time_start=time.time()
time_end=time.time()
print('totally cost',time_end-time_start)

import time

print "time.time(): %f " % time.time()
print time.localtime( time.time() )
print time.asctime( time.localtime(time.time()) )

time.time(): 1234892919.655932
(2009, 2, 17, 10, 48, 39, 1, 48, 0)
Tue Feb 17 10:48:39 2009

%%time
import time
for _ in range(1000):
  time.sleep(0.01)# sleep for 0.01 seconds
 
output:
CPU times: user 196 ms, sys: 21.4 ms, total: 217 ms
Wall time: 11.6 s

import numpy
%time numpy.random.normal(size=1000)
output:
Wall time: 1e+03 µs

import numpy
%timeit numpy.random.normal(size=100)
 
output:
12.8 µs ± 1.25 µs per loop (mean ± std. dev. of 7 runs, 100000 loops each)