Proxy list to a list-returning function
This small package provides a proxy list to a list-returning function:
>>> from lazylist import LazyList >>> l = LazyList(lambda: x) >>> x = [1, 2, 3] >>> list(l) [1, 2, 3]
More precisely, view function doesn’t have to return an exact list, but an any squence object e.g. str, tuple:
>>> x = "hello" >>> list(l) ['h', 'e', 'l', 'l', 'o']
It satisfies collections.abc.Sequence protocol:
>>> from collections import Sequence >>> isinstance(l, Sequence) True >>> l[-1] 'o' >>> len(l) 5
However, it doesn’t satisfy collections.abc.MutableSequence protocol. In other words, it’s immutable:
>>> from collections import MutableSequence >>> isinstance(l, MutableSequence) False >>> l = 'H' Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'LazyList' object does not support item assignment
Distributed under LGPLv3 or higher.
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