1 #导入numpy 2 import numpy as np 3 #创建一维数组 4 a = np.array([1,2,3,4]) 5 print(a) 6 #创建二维数组 7 b = np.random.randint(4,10,size=(2,3)) 8 print(b) 9 #创建三维数组 10 c = np.random.randn(2,3,4) 11 print(c) 12 #ndim属性 13 print('ndim:',a.ndim,b.ndim,c.ndim) 14 #shape属性 15 print('shape:',a.shape,b.shape,c.shape) 16 #dtype属性 17 print('dtype:',a.dtype,b.dtype,c.dtype) 18 #size元素的总个数 19 print('size:',a.size,b.size,c.size) 20 #itemsize每个元素所占的字节 21 print('itemsize:',a.itemsize,b.itemsize,c.itemsize)
1 [1 2 3 4] 2 [[4 4 8] 3 [8 6 6]] 4 [[[-0.04322546 0.37600869 -0.84201739 0.3652211 ] 5 [ 0.30035931 0.54828284 0.26615364 -0.49428617] 6 [ 0.10315291 0.07493424 0.27695642 0.1780474 ]] 7 8 [[ 0.46234703 0.07898361 -1.2045445 0.61272457] 9 [-0.15794512 0.64909964 0.02984023 -0.57428904] 10 [ 0.03801586 -1.31788363 0.64976292 1.07791379]]] 11 ndim: 1 2 3 12 shape: (4,) (2, 3) (2, 3, 4) 13 dtype: int32 int32 float64 14 size: 4 6 24 15 itemsize: 4 4 8