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Idan Bar-Dov1,371 Points
slice without parameters vs. equal
Around 5:47, Kenneth creates a copy of messy_list by using slice, as follows: clean_list = messy_list[:]
What is the purpose of using slice here? dropping the slice part, as follows, seems cleaner. clean_list = messy_list
Cheo R37,150 Points
Take a look at:
lst = list(range(50)) also_lst = lst new_lst = lst[:] print("lst id: ", id(lst)) # lst id: 139777404330952 print("also_lst id: ", id(also_lst)) # also_lst id: 139777404330952 print("new_lst: ", id(new_lst)) # new_lst: 139777411441160 print(also_lst is lst) # True print(new_lst is lst) # False
Where the former assigns to variables to the same object (they both point to lst). The latter is assigned (points to) a new list (copied). The is operator tests if two variables point the same object, not if two variables have the same value