[Tutor] Object attributes surviving deletion

[Shrutarshi Basu]

Here's the relevant function:

   def parse_display(self ):

       try:
           gram = Grammars(10, 10, self.pc_map, self.hard_rules)
           gram.database = {}

           for key, list in self.grammars.iteritems():
               gram.addGram(key, list[0], list[1])

           self.modules.append(DisplayModule(self.img_map,
(self.xOrigin, self.yOrigin), self.rows, self.columns, gram,
self.type))

           del gram

           self.pc_map = {}
           self.hard_rules =[]
           self.grammars = {}
           self.img_map = {}
       except Exception, inst:
           print inst

As you can see, not only do I delete gram, I also blank out everything
that should be cleared. I have to manually clear gram.database because
otherwise it keeps the data from previous calls to that function. I
don't understand why this should be. DisplayModule is a class that
packages and organizes the data into a convenient form.
Thanks,


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