extracting keywords from %(keyword)s-based templates

[Andrew Dalke]

Daniel Dittmar wrote:
>Try:
>
>class KeywordTrap:
>    def __init__ (self):
>        self.allwords = {}
>
>    def __getitem__ (self, keyword):
>        self.allwords [keyword] = 1
>        return 0  # should work for %s and %d

To be more complete, this supports additional conversion types.
(Warning: untested)

class KeywordTrap:
  def __init__(self):
     self.allwords = {}
  def __getitem__(self, keyword):
     self.allwords[keyword] = 1
     return self
  def __int__(self): return 0
  def __str__(self): return ""
  def __float__(self): return 0.0
  def __oct__(self): return "0"
  def __hex__(self): return "0"
  def __long__(self): return 1L

                    Andrew
                    dalke at dalkescientific.com