code: def _get_boolean_property(self, propname):
          
          tblPr = self.tblPr
          if tblPr is None:
              return False
          propval = getattr(tblPr, propname)
          return {
              True:  True,
              False: False,
              None:  False
          }[propval]
docs: Generalized getter for the boolean properties on the ``<a:tblPr>``
          child element. Defaults to False if *propname* attribute is missing
          or ``<a:tblPr>`` element itself is not present.