loops and lists for in range(len(somelist[ ][ ]))value somelist[ ][ ][ work with value although their logic is the same as regular (one-dimensionalfor loopsnested loops look more complicated and it can take some time to fully understand how they work as noted abovea good way to obtain such understanding is to create some examples of small nested lists in python shell or small python programand examine the results of indexing and looping over the lists the following code is one such example try to step through this program by hand and predict the output before running the code and checking the resultl [[ ][- ]for row in lfor column in rowprint(columnlist slicing is used to extract parts of list we have seen how we can index list to extract single elementbut sometimes it is useful to capture parts of listfor instanceall the elements from an index to an index python offers list slicing for such tasks for list awe have seen that single element is extracted with [ ]where is an integerbut we can also use the more general syntax [start:stop:stepto extract slice of the arguments resemble those of the range functionand such list slicing will extract all elements starting from index start up to but not including stopwith step step as for the range functionwe can omit some of the arguments and rely on default values the following examples illustrate the use of slicinga [ [ :from index to end of list [ [ : [ from index up tobut not incl index [: from start up tobut not incl index [ [ :- from index to next last element [ [:the whole list [ note that these sublists (slicesare copies of the original list statement such asfor instanceb [:will make copy of the entire list aand any subsequent changes to will not change as for the nested lists considered abovea good way to become familiar with list slicing is to create small