Collections.OrderedDict() python

Problem Statement :

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.



>>> 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)])


You are the manager of a supermarket.
You have a list of N 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.

Input Format

The first line contains the number of items, N.
The next N lines contains the item's name and price, separated by a space.


Output Format

Print the item_name and net_price in order of its first occurrence.

Solution :


                            Solution in C :

from collections import OrderedDict
n, d = int(input()), OrderedDict()
for _ in range(n):
    line = input().rstrip().split()
    item_name, net_price = ' '.join(line[:-1]), int(line[-1])
    if item_name in d: d[item_name] += net_price
    else: d[item_name] = net_price

for item in sorted(sorted(d, key=lambda t: t[0])):
    print(item, d[item])

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