Python - How To Pass Instance Variable Value To Descriptor Parameter?

Considering below case, ItemList Class: # filename: item_list.py # locators dictionary is intentionally placed outside `ItemList` class locators = { 'item_id': 'css=tr:nth-of-

Solution 1:

I found this article and came up with solution to add the descriptors to an object.

This solution below worked for me:

1. Add __getattribute__ and __setattr__ into Item Class

   # filename: item.pyimport abc
   
   
   classItem(Page):
       __metaclass__ = abc.ABCMeta
   
       def__init__(self, context):
           self.__context = context
           super(Item, self).__init__(
               self.__context.browser
           )
   
       def__getattribute__(self, name):
           value = object.__getattribute__(self, name)
           ifhasattr(value, '__get__'):
               value = value.__get__(self, self.__class__)
           return value
   
       def__setattr__(self, name, value):
           try:
               obj = object.__getattribute__(self, name)
           except AttributeError:
               passelse:
               ifhasattr(obj, '__set__'):
                   return obj.__set__(self, value)
           returnobject.__setattr__(self, name, value)
   

2. Move class attribute to instance attribute in ItemList constructor

   # filename: item_list.py# locators dictionary is intentionally placed outside `ItemList` class
   locators = {
       'item_id': 'css=tr:nth-of-type({item_num}) .id',
       'item_title': 'css=tr:nth-of-type({item_num}) .alert-rules',
       # other properties
   }
   
   
   classItemList(Item):
       def__init__(self, context, item_num=0):
           self.item_num = item_num
           # self.item_num is able to be passed to locators
           self.item_id = TextReadOnly(locators['item_id'].format(item_num=self.item_num))
           self.item_title = TextReadOnly(locators['item_title'].format(item_num=self.item_num))
   
           super(ItemList, self).__init__(
               context
           )