docs: def get_property(elt, key, ctx=None):
      """Get elt key property.
  
      :param elt: property elt. Not None methods.
      :param key: property key to get from elt.
      :param ctx: elt ctx from where get properties. Equals elt if None. It
          allows to get function properties related to a class or instance if
          related function is defined in base class.
  
      :return: list of property values by elt.
      :rtype: list
      """
  
      result = []
  
      properties = get_properties(elt=elt, ctx=ctx, keys=key)
  
      if key in properties:
          result = properties[key]
  
      return result