code: def get_venvs(self):
          
  
          def raise_():
              error_str = 'Virtual environments are not created. Please run `bootstrap` command.'
              self.logger.error(error_str)
              raise DjangoDevException(error_str)
  
          if not os.path.exists(self.venvs_path):
              raise_()
          venvs = os.listdir(self.venvs_path)
          if not venvs:
              raise_()
  
          venvs.sort()
          return venvs
docs: Returns a list of names of available virtual environments.
  
          :raises: DjangoDevException on errors
          :rtype: list
          :return: list of names