FAQ: Collections - OrderedDict

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This community-built FAQ covers the “OrderedDict” exercise from the lesson “Collections”.

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This exercise can be found in the following Codecademy content:

Learn Intermediate Python 3

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[nisett99]

https://www.codecademy.com/courses/learn-intermediate-python-3/lessons/collections-python/exercises/ordereddict-python

Can anyone help me understand this, I think I’ve done this exercise correctly however the hint for step 2 says
" In order to loop through the OrderedDict while keeping track of the index, you can use a counter variable or you can enumerate the items in orders. This looks like: for i, (k, v) in enumerate(orders.items()):. Remember to break once you reach far enough. Also, you can modify the OrderedDict by setting the value after accessing it using a key: orders[key_value] = 'completed purchase'"
But I don’t understadn why we need to keep track of the index, use the ennumerate method, or break?

I’ll include the code I wrote in the codebyte, it passes and lets me move on, I just feel like maybe I’m missing a point the exercise is trying to make.

from collections import OrderedDict # The first 15 orders are provided order_data = [['Order: 1', 'purchased'], ['Order: 2', 'purchased'], ['Order: 3', 'purchased'], ['Order: 4', 'returned'], ['Order: 5', 'purchased'], ['Order: 6', 'canceled'], ['Order: 7', 'returned'], ['Order: 8', 'purchased'], ['Order: 9', 'returned'], ['Order: 10', 'canceled'], ['Order: 11', 'purchased'], ['Order: 12', 'returned'], ['Order: 13', 'purchased'], ['Order: 14', 'canceled'], ['Order: 15', 'purchased']] # Write your code below! orders = OrderedDict(order_data) to_move = [] to_remove = [] for k, v in orders.items(): if v == 'returned': to_move.append(k) elif v == 'canceled': to_remove.append(k) for order in to_remove: orders.pop(order) for order in to_move: orders.move_to_end(order) print(orders)