NLTK 3: Generating the list of possible productions for a node

[Lenin Raj Rajasekaran]

Given I have a CFG like this:

cfg = nltk.CFG.fromstring("""

root -> who_player has the most runs

who_player -> who

who_player -> which player

who_player -> which team player

who -> 'who'

which -> 'which'

player -> 'player'

team -> 'indian' | 'australian' | 'england'

has -> 'has'

this -> 'this'

most -> 'most'

runs -> 'runs'

""")

Now, cfg.productions() provides a data structure with lhs, rhs etc., 

How do I get the list of possible generations for "who_player" node. Following is the expected result:

(list) ['who', 'which player', 'which indian player', 'which australian player', 'which england player']

[Lenin Raj Rajasekaran]

I just found that we could use 

list((n,sent) for n, sent in enumerate(generate.generate(cfg, n=10, start=Nonterminal('who_player')), 1))

to generate the possible productions of 'who_player' node.