nltk.Production

class nltk.Production(lhs, rhs)[source]

A grammar production. Each production maps a single symbol on the “left-hand side” to a sequence of symbols on the “right-hand side”. (In the case of context-free productions, the left-hand side must be a Nonterminal, and the right-hand side is a sequence of terminals and Nonterminals.) “terminals” can be any immutable hashable object that is not a Nonterminal. Typically, terminals are strings representing words, such as "dog" or "under".

See:

CFG
See:

DependencyGrammar
See:

Nonterminal
Variables:
  • _lhs – The left-hand side of the production.
  • _rhs – The right-hand side of the production.

Methods

__init__(lhs, rhs) Construct a new Production.
is_lexical() Return True if the right-hand contain at least one terminal token.
is_nonlexical() Return True if the right-hand side only contains Nonterminals
lhs() Return the left-hand side of this Production.
rhs() Return the right-hand side of this Production.
unicode_repr() Return a concise string representation of the Production.