numpy科学计算库

 1 import numpy as np
 2 vector = numpy.array([5,10,15,20])
 3 matrix = numpy.array([[5,10,15],[20,25,30],[35,40,45]])
 4 print(vector)
 5 print(matrix)
 6 print(vector.shape)
 7 vector = numpy.array([5,10,15,20])
 8 matrix = numpy.array([[5,10,15],[20,25,30],[35,40,45]])
 9 print(vector)
10 print(matrix)
11 print(vector.shape)
12 print(np.ones((2,3,4),dtype = np.int32))
13 
14 print(np.linspace(0,2,100))