Skip to main content

Proxy list to a list-returning function

Project description

PyPI Build Status

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[0] = '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.

Todos

  • LazySet

  • LazyMap

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

lazylist-0.9.0.tar.gz (2.3 kB view hashes)

Uploaded source

Built Distribution

lazylist-0.9.0-py2.py3-none-any.whl (3.9 kB view hashes)

Uploaded 3 5

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page