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Collections.OrderedDict()

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 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.

Constraints :

0 < N <= 100

Output Format :

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

Sample Input :

9 BANANA FRIES 12 POTATO CHIPS 30 APPLE JUICE 10 CANDY 5 APPLE JUICE 10 CANDY 5 CANDY 5 CANDY 5 POTATO CHIPS 30

Sample Output :

BANANA FRIES 12 POTATO CHIPS 60 APPLE JUICE 20 CANDY 20

Explanation :

BANANA FRIES: Quantity bought: 1, Price: 12 Net Price: 12 POTATO CHIPS: Quantity bought: 2, Price: 30 Net Price: APPLE JUICE: Quantity bought: 2, Price: 10 Net Price: 20 CANDY: Quantity bought: 4, Price: 5

Net Price:20

Solution

from collections import*; N = int(input()); d = OrderedDict(); for i in range(N): item = input().split() itemPrice = int(item[-1]) itemName = " ".join(item[:-1]) if(d.get(itemName)): d[itemName] += itemPrice else: d[itemName] = itemPrice for i in d.keys(): print(i, d[i])

Result

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