Python

Working with Collections

# Create an ordered dictionary of {item: quantity} given items
items = ["cheese", "yoghurt", "tomatoes", "yoghurt", "onions", "milk", "milk", "cheese"]


# Create an ordered dictionary of {item: quantity} given items
from collections import OrderedDict

items = ["cheese", "yoghurt", "tomatoes", "yoghurt", "onions", "milk", "milk", "cheese"]

cart = OrderedDict()
for item in items:
  cart[item] = cart.get(item, 0) + 1

print(cart)
