numpy.c_ — NumPy v1.22 Manual
https://numpy.org/doc/stable/reference/generated/numpy.c_.html
numpy.c_¶ numpy. c_ = <numpy.lib.index_tricks.CClass object> ¶ Translates slice objects to concatenation along the second axis. This is short-hand for np.r_['-1,2,0', index expression], which is useful because of its common occurrence.In particular, arrays will be stacked along their last axis after being upgraded to at least 2-D with 1’s post-pended to the shape (column …
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