nltk.parse.api module

class nltk.parse.api.ParserI

Bases: object

A processing class for deriving trees that represent possible structures for a sequence of tokens. These tree structures are known as “parses”. Typically, parsers are used to derive syntax trees for sentences. But parsers can also be used to derive other kinds of tree structure, such as morphological trees and discourse structures.

Subclasses must define:

• at least one of: parse(), parse_sents().

Subclasses may define:

• grammar()

grammar()

Returns

The grammar used by this parser.

parse(sent, *args, **kwargs)

Returns

An iterator that generates parse trees for the sentence. When possible this list is sorted from most likely to least likely.

Parameters

sent (list(str)) – The sentence to be parsed

Return type

iter(Tree)

parse_sents(sents, *args, **kwargs)

Apply self.parse() to each element of sents. :rtype: iter(iter(Tree))

parse_all(sent, *args, **kwargs)

Return type

list(Tree)

parse_one(sent, *args, **kwargs)

Return type

Tree or None