nltk.chunk.regexp.ExpandLeftRule

class documentation

class ExpandLeftRule(RegexpChunkRule): (source)

Constructor: ExpandLeftRule(left_tag_pattern, right_tag_pattern, descr)

A rule specifying how to expand chunks in a ChunkString to the left, using two matching tag patterns: a left pattern, and a right pattern. When applied to a ChunkString, it will find any chunk whose beginning matches right pattern, and immediately preceded by a strip whose end matches left pattern. It will then expand the chunk to incorporate the new material on the left.

Method	`__init__`	Construct a new `ExpandRightRule`.
Method	`__repr__`	Return a string representation of this rule. It has the form:
Instance Variable	`_left_tag_pattern`	Undocumented
Instance Variable	`_right_tag_pattern`	Undocumented

Inherited from RegexpChunkRule:

Static Method	`fromstring`	Create a RegexpChunkRule from a string description. Currently, the following formats are supported:
Method	`apply`	Apply this rule to the given `ChunkString`. See the class reference documentation for a description of what it means to apply a rule.
Method	`descr`	Return a short description of the purpose and/or effect of this rule.
Instance Variable	`_descr`	Undocumented
Instance Variable	`_regexp`	Undocumented
Instance Variable	`_repl`	Undocumented

def __init__(self, left_tag_pattern, right_tag_pattern, descr): (source) ¶

overrides nltk.chunk.regexp.RegexpChunkRule.__init__

Construct a new ExpandRightRule.

Parameters
left_tag_pattern:str	This rule's left tag pattern. When applied to a `ChunkString`, this rule will find any chunk whose beginning matches this pattern, and immediately preceded by a strip whose end matches `left_tag_pattern`. It will then expand the chunk to incorporate the new material on the left.
right_tag_pattern:str	This rule's right tag pattern. When applied to a `ChunkString`, this rule will find any chunk whose beginning matches `right_tag_pattern`, and immediately preceded by a strip whose end matches this pattern. It will then merge those two chunks into a single chunk.
descr:str	A short description of the purpose and/or effect of this rule.

def __repr__(self): (source) ¶

overrides nltk.chunk.regexp.RegexpChunkRule.__repr__

Return a string representation of this rule. It has the form:

<ExpandLeftRule: '<NN|DT|JJ>', '<NN|JJ>'>

Note that this representation does not include the description string; that string can be accessed separately with the descr() method.

Returns
str	Undocumented

_left_tag_pattern = (source) ¶

Undocumented

_right_tag_pattern = (source) ¶

Undocumented