import numpy as np
import time

REPS = 200

s = np.ones(500).reshape(25,20)

t = time.time()
for i in range(REPS):
	for j in range(s.shape[1]):
		min(s[:,j])
print("builtin min: %.3f seconds" % (time.time() - t))

t = time.time()
for i in range(REPS):
	for j in range(s.shape[1]):
		np.min(s[:,j])
print("numpy   min: %.3f seconds" % (time.time() - t))