(base) ling388-24$ ls -l g.txt
-rw-r--r--  1 sandiway  staff  141 Apr 18 12:47 g.txt
(base) ling388-24$ python
Python 3.9.16 | packaged by conda-forge | (main, Feb  1 2023, 21:38:11) 
[Clang 14.0.6 ] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import nltk
>>> g = open('g.txt').read()
>>> g
"S -> NP VP\nNP -> DT NN\nDT -> 'a'\nNN -> 'man'\nVP -> VBD NP PP\nDT -> 'the'\nNN -> 'boy'\nPP -> IN NP\nIN -> 'with'\nNN -> 'telescope'\nVBD -> 'saw'\n"
>>> cfg = nltk.CFG.fromstring(g)
>>> cfg
<Grammar with 11 productions>
>>> parser = nltk.ChartParser(cfg)
>>> parser
<nltk.parse.chart.ChartParser object at 0x104a1f550>
>>> for parse in parser.parse(nltk.word_tokenize("a boy saw the man with a telescope")):
...     parse.draw()
... 
>>> for parse in parser.parse(nltk.word_tokenize("a boy saw the man")):
...     parse.draw()
... 
>>> cfg = nltk.CFG.fromstring(open('g.txt').read())
>>> cfg
>>> cfg
<Grammar with 12 productions>
>>> parser = nltk.ChartParser(cfg)
>>> for parse in parser.parse(nltk.word_tokenize("a boy saw the man")):
...     parse.draw()
... 
>>> parser = nltk.ChartParser(nltk.CFG.fromstring(open('g.txt').read()))
>>> parser
<nltk.parse.chart.ChartParser object at 0x14a9f7370>
>>> for parse in parser.parse(nltk.word_tokenize("a boy saw the man with a telescope")):
...     parse.draw()
... 
>>> parser2 = nltk.ChartParser(nltk.CFG.fromstring(open('g2.txt').read()))
>>> for parse in parser2.parse(nltk.word_tokenize("a boy saw the man with a telescope")):
...     parse.draw()
... 
>>> for parse in parser2.parse(nltk.word_tokenize("a telescope saw the boy")):
...     parse.draw()
... 
>>> parser2 = nltk.ChartParser(nltk.CFG.fromstring(open('g2.txt').read()))
>>> for parse in parser2.parse(nltk.word_tokenize("John saw the boy")):
...     parse.draw()
... 
>>>