nltk.tree.ImmutableTree

class documentation

class ImmutableTree(Tree): (source)

Known subclasses: nltk.tree.ImmutableMultiParentedTree, nltk.tree.ImmutableParentedTree, nltk.tree.ImmutableProbabilisticTree

Constructor: ImmutableTree(node, children)

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Undocumented

Method	`__delitem__`	Undocumented
Method	`__delslice__`	Undocumented
Method	`__hash__`	Undocumented
Method	`__iadd__`	Undocumented
Method	`__imul__`	Undocumented
Method	`__init__`	Undocumented
Method	`__setitem__`	Undocumented
Method	`__setslice__`	Undocumented
Method	`append`	Undocumented
Method	`extend`	Undocumented
Method	`pop`	Undocumented
Method	`remove`	Undocumented
Method	`reverse`	Undocumented
Method	`set_label`	Set the node label. This will only succeed the first time the node label is set, which should occur in ImmutableTree.__init__().
Method	`sort`	Undocumented
Instance Variable	`_hash`	Undocumented
Instance Variable	`_label`	Undocumented

Inherited from Tree:

Class Method	`convert`	Convert a tree between different subtypes of Tree. `cls` determines which class will be used to encode the new tree.
Class Method	`fromlist`	Convert nested lists to a NLTK Tree
Class Method	`fromstring`	Read a bracketed tree string and return the resulting tree. Trees are represented as nested brackettings, such as:
Method	`__add__`	Undocumented
Method	`__copy__`	Undocumented
Method	`__deepcopy__`	Undocumented
Method	`__eq__`	Undocumented
Method	`__getitem__`	Undocumented
Method	`__lt__`	Undocumented
Method	`__mul__`	Undocumented
Method	`__radd__`	Undocumented
Method	`__repr__`	Undocumented
Method	`__rmul__`	Undocumented
Method	`__str__`	Undocumented
Method	`chomsky_normal_form`	This method can modify a tree in three ways:
Method	`collapse_unary`	Collapse subtrees with a single child (ie. unary productions) into a new non-terminal (Tree node) joined by 'joinChar'. This is useful when working with algorithms that do not allow unary productions, and completely removing the unary productions would require loss of useful information...
Method	`copy`	Undocumented
Method	`draw`	Open a new window containing a graphical diagram of this tree.
Method	`flatten`	Return a flat version of the tree, with all non-root non-terminals removed.
Method	`freeze`	Undocumented
Method	`height`	Return the height of the tree.
Method	`label`	Return the node label of the tree.
Method	`leaf_treeposition`	No summary
Method	`leaves`	Return the leaves of the tree.
Method	`pformat`	No summary
Method	`pformat_latex_qtree`	Returns a representation of the tree compatible with the LaTeX qtree package. This consists of the string `\Tree` followed by the tree represented in bracketed notation.
Method	`pos`	Return a sequence of pos-tagged words extracted from the tree.
Method	`pprint`	Print a string representation of this Tree to 'stream'
Method	`pretty_print`	Pretty-print this tree as ASCII or Unicode art. For explanation of the arguments, see the documentation for `nltk.treeprettyprinter.TreePrettyPrinter`.
Method	`productions`	Generate the productions that correspond to the non-terminal nodes of the tree. For each subtree of the form (P: C1 C2 ... Cn) this produces a production of the form P -> C1 C2 ... Cn.
Method	`subtrees`	Generate all the subtrees of this tree, optionally restricted to trees matching the filter function.
Method	`treeposition_spanning_leaves`	No summary
Method	`treepositions`	No summary
Method	`un_chomsky_normal_form`	This method modifies the tree in three ways:
Class Variable	`__ge__`	Undocumented
Class Variable	`__gt__`	Undocumented
Class Variable	`__le__`	Undocumented
Class Variable	`__ne__`	Undocumented
Class Variable	`node`	Undocumented
Class Method	`_parse_error`	Display a friendly error message when parsing a tree string fails. :param s: The string we're parsing. :param match: regexp match of the problem token. :param expecting: what we expected to see instead.
Method	`_frozen_class`	Undocumented
Method	`_get_node`	Outdated method to access the node value; use the label() method instead.
Method	`_pformat_flat`	Undocumented
Method	`_repr_png_`	Draws and outputs in PNG for ipython. PNG is used instead of PDF, since it can be displayed in the qt console and has wider browser support.
Method	`_set_node`	Outdated method to set the node value; use the set_label() method instead.