The method used in this article is from the link below, thanks! Sorting arrays in NumPy by column
arr = np.array([[1,3,5],[4,2,0]])
print(f'arr\n{arr}')
# 按第2列排序（column index = 1）
print('按第2列排序\n',arr[arr[:,1].argsort()])
# 按第2行排序（row index = 1）
print('按第2行排序\n',arr[:,arr[1,:].argsort()])
arr [[1 3 5] [4 2 0]] Sort by column 2 [[4 2 0] [1 3 5]] Sort by row 2 [[5 3 1] [0 2 4]]
Attached a schematic diagram of DataFrame sorting
