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Class for representing hierarchical language structures, such as syntax trees and morphological trees.

Classes

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ProbabilisticMixIn
A mix-in class to associate probabilities with other classes (trees, rules, etc.).

Tree
A hierarchical structure.

ImmutableTree

AbstractParentedTree
An abstract base class for Trees that automatically maintain pointers to their parents.

ParentedTree
A Tree that automatically maintains parent pointers for single-parented trees.

MultiParentedTree
A Tree that automatically maintains parent pointers for multi-parented trees.

ImmutableParentedTree

ImmutableMultiParentedTree

ProbabilisticTree

ImmutableProbabilisticTree

Functions

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_child_names(tree)

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tree

bracket_parse(s)
Parse a treebank string and return a tree.

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tree

sinica_parse(s)
Parse a Sinica Treebank string and return a tree.

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demo()
A demonstration showing how Trees and Trees can be used. source code

Function Details

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bracket_parse(s)

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Parse a treebank string and return a tree. Trees are represented as nested brackettings, e.g. (S (NP (NNP John)) (VP (V runs))).

Parameters:

s (string) - The string to be converted

Returns: tree

A tree corresponding to the string representation.

sinica_parse(s)

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Parse a Sinica Treebank string and return a tree. Trees are represented as nested brackettings, as shown in the following example (X represents a Chinese character): S(goal:NP(Head:Nep:XX)|theme:NP(Head:Nhaa:X)|quantity:Dab:X|Head:VL2:X)#0(PERIODCATEGORY)

Parameters:

s (string) - The string to be converted

Returns: tree

A tree corresponding to the string representation.

demo()

source code

A demonstration showing how Trees and Trees can be used. This demonstration creates a Tree, and loads a Tree from the treebank corpus, and shows the results of calling several of their methods.