code: def calculate_ticks(self):
          
          current_version = packaging.version.parse(matplotlib.__version__)
          critical_version = packaging.version.parse('3.0.0')
  
          if current_version > critical_version:
              locator, formatter = self._base._get_ticker_locator_formatter()
              return self._base._ticker(locator, formatter)
          else:
              return self._base._ticker()
docs: Returns the sequence of ticks (colorbar data locations),
          ticklabels (strings), and the corresponding offset string.