code: def deprecated(new_fct_name, logger=None):
      
      if logger is None:
          logger = logging.getLogger("kodex")
      nfct_name = new_fct_name
      def aux_deprecated(func):
          """This is a decorator which can be used to mark functions
          as deprecated. It will result in a warning being emmitted
          when the function is used."""
          def newFunc(*args, **kwargs):
              msg = "DeprecationWarning: use '%s' instead of '%s'." % (new_fct_name, func.__name__)
              logger.warning(msg)
              warnings.warn(msg, category=DeprecationWarning)
              return func(*args, **kwargs)
          newFunc.__name__ = func.__name__
          newFunc.__doc__ = func.__doc__
          newFunc.__dict__.update(func.__dict__)
          return newFunc
      return aux_deprecated
docs: Decorator to notify that a fct is deprecated