lazylist
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)
5However, it doesn't satisfy collections.abc.MutableSequence protocol.
In other words, it's immutable:
>>> from collections import MutableSequence
>>> isinstance(l, MutableSequence)
False
>>> l[0] = 'H'
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'LazyList' object does not support item assignmentDistributed under LGPLv3 or higher.
Todos
LazySetLazyMap
