np.hstack(（数组1, 数组2）)

# 注意： 值是元祖

# 0轴长要相同

import numpy as np

arr1 = np.arange(0, 12).reshape(2, 6)

arr2 = np.arange(12, 22).reshape(2, 5)

arr3 = np.hstack((arr1, arr2))

print(arr3)

np.vstack((数组1, 数组2))

# 注意： 元祖

# 1轴长度要相等

import numpy as np

arr1 = np.arange(0, 12).reshape(2, 6)

arr2 = np.arange(12, 30).reshape(3, 6)

arr3 = np.vstack((arr2, arr1))

print(arr3)

a, b = b, a

# a和b交换值

import numpy as np

arr1 = np.arange(0, 12).reshape(3, 4)

print(arr1)

# 第1行和第2行交换

arr1[[0, 1], :] = arr1[[1, 0], :]

print('-' * 30)

print(arr1)

import numpy as np

arr1 = np.arange(0, 12).reshape(3, 4)

print(arr1)

# 交换第2列和第4列

arr1[:, [1, 3]] = arr1[:, [3, 1]]

print('*' * 40)

print(arr1)