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Package provides Andersson Tree implementation in pure Python.

Project description

AnderssonTree Package


This package provides Andersson Tree implementation written in pure Python.

Sources of Algorithms

Some concepts are inspired by bintrees package at, although this implementation does not support dict, heap, set compatibility.


  • AnderssonTree() -> new empty tree;
  • AnderssonTree(mapping) -> new tree initialized from a mapping (requires only an items() method)
  • AnderssonTree(seq) -> new tree initialized from seq [(k1, v1), (k2, v2), … (kn, vn)]


  • __contains__(k) -> True if T has a key k, else False
  • __delitem__(y) <==> del T[y]
  • __getitem__(y) <==> T[y]
  • __iter__() <==> iter(T) <==> keys()
  • __len__() <==> len(T)
  • __repr__() <==> repr(T)
  • __reversed__() <==> reversed(T), reversed keys
  • __setitem__(k, v) <==> T[k] = v
  • __copy__() <==> copy()
  • clear() -> None, remove all items from T
  • copy() -> a shallow copy of T, tree structure, i.e. key insertion order is preserved
  • dump([order]) -> None, dumps tree according to order
  • get(k) -> T[k] if k in T, else None
  • insert(k, v) -> None, insert node with key k and value v, replace value if key exists
  • is_empty() -> True if len(T) == 0
  • iter_items([, reverse]) -> generator for (k, v) items of T
  • keys([reverse]) -> generator for keys of T
  • remove(key) -> None, remove item by key
  • remove_items(keys) -> None, remove items by keys
  • root() -> root node
  • traverse(f, [order]) -> visit all nodes of tree according to order and call f(node) for each node
  • update(E) -> None. Update T from dict/iterable E
  • values([reverse]) -> generator for values of T

Order values

  • ORDER_INFIX_LEFT_RIGHT - infix order, left child first, then right
  • ORDER_INFIX_RIGHT_LEFT - infix order, right child first, then left
  • ORDER_PREFIX_LEFT_RIGHT - prefix order, left child first, then right
  • ORDER_PREFIX_RIGHT_LEFT - prefix order, right child first, then left
  • ORDER_POSTFIX_LEFT_RIGHT - postfix order, left child first, then right
  • ORDER_POSTFIX_RIGHT_LEFT - postfix order, right child first, then left


from source:

python install

or from PyPI:

pip install anderssontree


this README.rst, code itself, docstrings

anderssontree can be found on at:

Tested With

Python2.7.5, Python3.3.2

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