_{collections.OrderedDict}

An OrderedDict is a dictionary that remembers the order of the keys that were inserted first. If a new entry overwrites an existing entry, the original insertion position is left unchanged.

Example

_Code

>>> from collections import OrderedDict >>> >>> ordinary_dictionary = {} >>> ordinary_dictionary['a'] = 1 >>> ordinary_dictionary['b'] = 2 >>> ordinary_dictionary['c'] = 3 >>> ordinary_dictionary['d'] = 4 >>> ordinary_dictionary['e'] = 5 >>> >>> print ordinary_dictionary {'a': 1, 'c': 3, 'b': 2, 'e': 5, 'd': 4} >>> >>> ordered_dictionary = OrderedDict() >>> ordered_dictionary['a'] = 1 >>> ordered_dictionary['b'] = 2 >>> ordered_dictionary['c'] = 3 >>> ordered_dictionary['d'] = 4 >>> ordered_dictionary['e'] = 5 >>> >>> print ordered_dictionary OrderedDict([('a', 1), ('b', 2), ('c', 3), ('d', 4), ('e', 5)]) 

Task

You are the manager of a supermarket.
You have a list of items together with their prices that consumers bought on a particular day.
Your task is to print each item_name and net_price in order of its first occurrence.

_{item_name = Name of the item.
net_price = Quantity of the item sold multiplied by the price of each item.}