CODEWITHSUNDEEP
pythonlist
Rishabh
Rishabh

Reputation: 1

Parsing a List of Dictionaries

I have a list of dictionaries:

[{"id":1,"value":"p1","num":2},{"id":2,"value":"p1","num":4},{"id":3,"value":"p2","num":4}]

I want to iterate this list by only having id and create a list based on first picking up p1 and then p2, if p1 is in multiple , then giving priority to the higher number

out = [2,1,3]

How do I do it in one loop?

Upvotes: 0

Views: 416

Answers (1)

Adam Smith
Adam Smith

Reputation: 54193

Well there's no way to do this in only one loop, since your sorting is custom. You have to at least sort it first.

def sort_function(d):
    value_str, num = d['value'], d['num']

    # This assumes that 'p2' should sort before 'p12'
    value = int(value_str[1:])  # strips off the 'p' and treats the rest as a number
    return (value, -num)

out = [dct['id'] for dct in sorted(input_dictionary, key=sort_function)]

Upvotes: 2

Related Questions