Get values from a dataframe based on a nested list in Python

I have a dataframe in Python called "Item_Table" and it looks like the below:

--------------------------
item_id | item_description
--------------------------
N4      | Steel
M3      | Oil
B1      | Water
X9      | Coal
Z5      | Plastic
--------------------------

I also have a nested orders list which looks like below. Each list inside the nested list represents one order. One order can have multiple items

orders = [[Z5], [X9, Z5], [B1, Z5, N4], [B1, X9]]

Ideally, I would like to return a nested list with the respective item_descriptions from the "Item_Table" which looks like the below nested list:

orders_descriptions = [[Plastic], [Coal, Plastic], [Water, Plastic, Steel], [Water, Coal]]

I tried a solution where I converted orders list to a dataframe and tried to merge that with item_table to get item_descriptions but because one order has multiple items, I am unable to do the join.

>Solution :

You can try export the item_id and item_description to dictionary then loop the orders

d = df.set_index('item_id')['item_description'].to_dict()

orders_descriptions = [[d[o] for o in os] for os in orders]

print(orders_descriptions)

[['Plastic'], ['Coal', 'Plastic'], ['Water', 'Plastic', 'Steel'], ['Water', 'Coal']]