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zipper's Introduction

Zipper Build Status

A datastructure, first described by Huet, is used to traverse and manipulate immutable trees. This library is a port of the zipper implementation found in Clojure.

Usage

The zipper module provides several functions for creating a Loc object which represents the current focal point in the tree.

>>> import zipper
>>> top = zipper.list([1, [2, 3], 4])

>>> print top.down().right().node()
[2,3]

>>> print top.down().right().down().node()
2

>>> print top.down().right().down().replace(0).root()
[1, [0, 3], 4]

zipper's People

Contributors

srobertson avatar swagile1 avatar graingert avatar

Stargazers

avatar Shawn Zhang avatar Marco Federighi avatar Peppe avatar Alessandro Pappalardo avatar Dominic LoBue avatar Emma Doyle avatar Aaron Hosford avatar Andrew NS Yeow avatar avatar mago avatar rmuslimov avatar Carlos Martin avatar Frank Siler avatar Kris Wilson avatar avatar Will O'Brien avatar Jameel Al-Aziz avatar Richard Hull avatar Lionel Barret avatar Nicholas Pezolano avatar Michael Hood avatar Jacques Crocker avatar

Watchers

avatar Luke Pacholski avatar James Cloos avatar scott@zeepmobile.com avatar avatar

Forkers

emidln itegebo graingert swagile1

zipper's Issues

TypeError: 'module' object has no attribute '__getitem__'

When i try to run the zipper.py file using python 2.7 in macOS i get this error:

Traceback (most recent call last):
  File "zipper.py", line 18, in <module>
    native_list = __builtins__['list']
TypeError: 'module' object has no attribute '__getitem__'

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