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Draw the environment diagram.
def reverse(lst): if len(lst) <= 1: return lst return reverse(lst[1:]) + [lst] l = [1, [2, 3], 4] rev = reverse(l)
Followup: How would you modify this to deep-reverse a list - that is, if an element of the list is also a list, that element gets reversed as well (and all lists under it)?
What does the following code print?
lst = [None for _ in range(10)] for i in range(10): lst[i] = lambda: i for func in lst: print(func())
Implement a function
addup that takes in a
lst of numbers and a target value
n. It should return
True if some subset of
lst adds up to
n. Numbers in
lst may not be reused. For example:
>>> addup([3, 4, 5], 9) True # 4 + 5 = 9 >>> addup([3, 9, 27, 81], 3) True # 3 = 3 >>> addup([3, 9, 27, 81], 33) False
Followup: What needs to be changed if values in
lst can be reused?