读书笔记 numpy入门 第2章 数据属性

import numpy as np
np.random.seed(0)

x1 = np.random.randint(10, size=6)  
x2 = np.random.randint(10, size=(3, 4))  # 二维数组
x3 = np.random.randint(10, size=(3, 4, 5))  # 三维数组

print("x3 ndim: ", x3.ndim)
print("x3 shape:", x3.shape)
print("x3 size: ", x3.size)

x3 ndim:  3
x3 shape: (3, 4, 5)
x3 size:  60

print("dtype:", x3.dtype)

>>>dtype: int64

print("itemsize:", x3.itemsize, "bytes")
print("nbytes:", x3.nbytes, "bytes")

itemsize: 8 bytes
nbytes: 480 bytes