[Python] what and why is the difference between [:, 1] and [:, 1:2] when using...

import numpy as np
a = np.array([[1,2,3,4], [5,6,7,8], [9,10,11,12]])
col_r1 = a[:, 1]
col_r2 = a[:, 1:2]
print(col_r1, col_r1.shape)
print(col_r2, col_r2.shape)


i wonder why the output is differrent and how the difference is created.

I asked the deepseek for help,because of the responses are Chinese characters,so it is not convenient for me to show here.

Maybe the difference is subtle,so i don't really get what the ai wants to express.

or my comprehension is poor,hope to find the very right answer i can grasp

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