大家好，又见面了，我是你们的朋友全栈君。
import time
import math
import numpy as np
def timeit1():
s = time.time()
for i in range(750000):
z=i**.5
print ("Took %f seconds" % (time.time() - s))
def timeit2(arg=math.sqrt):
s = time.time()
for i in range(750000):
z=arg(i)
print ("Took %f seconds" % (time.time() - s))
def timeit3(arg=np.sqrt):
s = time.time()
for i in range(750000):
z=arg(i)
print ("Took %f seconds" % (time.time() - s))
def timeit4():
s = time.time()
for i in range(750000):
z=math.pow(i,.5)
print ("Took %f seconds" % (time.time() - s))
timeit1()
timeit2()
timeit3()
timeit4()
Took 0.152364 seconds
Took 0.061580 seconds
Took 1.016529 seconds
Took 0.215403 seconds
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