def edit_grammar(self, *e):
CFGEditor(self._top, self._parser.grammar(), self.set_grammar)
open_factor -> "("
close_factor -> ")"
open_set -> {open_set}
close_set -> {close_set}
zero -> "0"
not_zero -> {numbers}
letter -> {letters}
""".format(
open_set='"{"',
close_set='"}"',
numbers="|".join(map(lambda x: '"%s"' % x, string.digits[1:])),
letters="|".join(map(lambda x: '"%s"' % x, string.ascii_letters)),
)
grammar = nltk.CFG.fromstring(grammar_text)
if __name__ == '__main__':
rd_parser = nltk.ChartParser(grammar)
res = rd_parser.parse("Set1={1,2,3}")
print(list(res))
top = Tk()
editor = CFGEditor(top, grammar, print)
top.mainloop()