code: def validate_version(self, where=None):
          
          if where is not None:
              if (self.version[0] <= 0 and self.version[1] <= 10 and
                      self.version[2] < 1):
                  ws = incompatibility_doc % '.'.join(
                      [str(x) for x in self.version])
                  warnings.warn(ws, IncompatibilityWarning)
docs: are we trying to operate on an old version?