extracting keywords from %(keyword)s-based templates

[Daniel Dittmar]

Try:

class KeywordTrap:
    def __init__ (self):
        self.allwords = {}

    def __getitem__ (self, keyword):
        self.allwords [keyword] = 1
        return 0  # should work for %s and %d

trap = KeywordTrap ()
formatstring % trap
print trap.allwords.keys ()

Daniel