In List of Dicts find min value of a common Dict field

0 votes

I have a list of dictionaries like so:

[{'price': 99, 'barcode': '2342355'}, {'price': 88, 'barcode': '2345566'}]

I want to find the min() and max() prices. Now, I can sort this easily enough using a key with a lambda expression (as found in another SO article), so if there is no other way I'm not stuck. However, from what I've seen there is almost always a direct way in Python, so this is an opportunity for me to learn a bit more.

Aug 30, 2018 in Python by bug_seeker
• 15,550 points

2 answers to this question.

0 votes

There are several options. Here is a straight-forward one:

seq = [x['the_key'] for x in dict_list]


If you only wanted to iterate through the list once, you could try this (assuming the values could be represented as ints):

import sys

lo,hi = sys.maxint,-sys.maxint-1
for x in (item['the_key'] for item in dict_list):
    lo,hi = min(x,lo),max(x,hi)
answered Aug 30, 2018 by Priyaj
• 58,140 points
0 votes
lst = [{'price': 99, 'barcode': '2342355'}, {'price': 88, 'barcode': '2345566'}]

maxPricedItem = max(lst, key=lambda x:x['price'])
minPricedItem = min(lst, key=lambda x:x['price'])
answered Aug 31, 2018 by Omkar
• 69,150 points

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