python iloc() [[],[]] double list input

data called frame

A	B	C	D
a	0.560094	0.352686	0.954100
b	0.563728	0.335517	0.232902
c	0.482155	0.976618	0.565462
d	0.477146	0.933353	0.291764

若取[第一行和第四行]、[第一列和第四列]对应的数据:

code

frame.iloc[[0,3],[0,3]]

code meaning

frame.iloc[[the 1 th row, the 4th row],[the 1th column, the 4th column]]

code result

	A	D
a	0.560094	0.926277
d	0.477146	0.986668