[ copy( [ 'aprint(xy[ [' ' in [ ] [[ ' '] copy(equivalent to [: [ 'aprint(xy[[ ' '] [' ' in [ ] [[ ' '] copy( [ ][ 'bprint(xy[[' '' '] [[' '' '] the reason for this behavior is that python performs shallow copy in [ ]from copy import deepcopy [[ ' '] deepcopy(xy[ ][ 'bprint(xy[[ ' '] [[' '' '] sorting lists inplace operations in [ ] [ sort(print(xnone list sort(is an inplace operation in generalinplace operations are efficient as they do not create new copy in memory in [ ] [ sort(print( [ list sorted does create new variable in [ ] [ sorted(xprint( [