Reference library

Dictionaries & sets

Key–value maps, uniqueness, counting, grouping, and fast lookups.

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Dictionaries & sets easy

How to Sort a List of Dictionaries by Key in Python

Sort a list of dictionaries by various keys (grade, age, name) using lambda, itemgetter, and extract unique sorted names into a set.

sorting dictionaries sets
Python 
from operator import itemgetter

# Sample data: a list of dictionaries representing students
students = [
    {"name": "Alice", "grade": 88, "age": 23},
    {"name": "Bob", "grade": 95, "age": 22},
    {"name": "Charlie", "grade": 78, "age": 24},
    {"name": "Diana", "grade": 92, "age": 21}
]

# Sort by grade (descen…
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