In order to change into a list, the length of an instance is investigated first. "__len__()" Next, all the contents are taken out in order. "__getitem__()"
Python, 11 lines
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 | class Listlike:
def __init__(self):
self.list = [1, 2, 3, 4, 5]
def __getitem__(self, index):
return self.list[index]
def __len__(self):
return len(self.list)
>>> listlike = Listlike()
>>> list(listlike)
[1, 2, 3, 4, 5]
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Intrinsic function list() list-izes the character sequence and tuple other than an instance like the point. Besides calling list(), it can take out by tuple() or for loop, or map()/reduce()/filter() can be used.
Tags: programs
No need for __len__ here.