How to add columns to python arrays

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Hi there,

I wanna compile a 6000x1000 array with python. The array starts from
'empty', each time I get a 6000 length list, I wanna add it to the
exist array as a column vector. Is there any function to do so?

Or, I can add the list as a rows, if this is easier, and transpose the
whole array after all the rows are setup.

Thanks so much.