code: def _set_boolean_property(self, propname, value):
          
          if value not in (True, False):
              raise ValueError(
                  "assigned value must be either True or False, got %s" %
                  value
              )
          tblPr = self.get_or_add_tblPr()
          setattr(tblPr, propname, value)
docs: Generalized setter for boolean properties on the ``<a:tblPr>`` child
          element, setting *propname* attribute appropriately based on *value*.
          If *value* is True, the attribute is set to "1"; a tblPr child
          element is added if necessary. If *value* is False, the *propname*
          attribute is removed if present, allowing its default value of False
          to be its effective value.