list changes while doing with functions
def matMinor3x3(mat,a,b): minor=[[0,0],[0,0]] temp1=mat[:] for i in range(0,3): del temp1[i][b-1] del temp1[a-1] return temp1 A=[[1,2,3],[4,5,6],[7,8,9]] print A,matMinor3x3(A,1,1),A
This is my code. I searched about questions that asks list of variables changing. Their answer was to make copy with
copy=original[:]. But I tired, and it doesn't work. Split columns and reassemble them to make copy doesn't work either. Please help me. I was making inverse matrix code...