forninrange(20):print('testing dict with {} items'.format(n))foriinrange(n):# create dictd=dict()forjinrange(n):d[str(j)]=jprint(len(d))# delete an itemdeld[str(i)]print(len(d))# check itemsforjinrange(n):ifstr(j)ind:ifj==i:print(j,'in d, but it should not be')else:ifj!=i:print(j,'not in d, but it should be')