numpy.mean()的几种用法

import numpy as np
x = np.array([,,,,])
y = np.array([,,,,])
z = np.array([[,],[,]])#二维数组
np.mean(x==y)#返回条件成立的占比
Out[]: 
np.mean(x)#均值
Out[]: 

np.mean(z)
Out[]: 
np.mean(z,axis=)#按列求均值
Out[]: array([ ,  ])
np.mean(z,axis=)#按行求均值
Out[]: array([ ,  ])