Overview
Sort any data the way you need it using key functions and short anonymous lambda functions.
- sorted() vs list.sort()
- key= functions
- lambda expressions
- reverse=True
Short Course
sorted() returns a new sorted list. Pass key= a function that picks
what to compare — a lambda is a tiny one-line function, perfect for this.
words = ["banana", "kiwi", "apple"]
sorted(words) # -> ['apple', 'banana', 'kiwi']
sorted(words, key=len) # -> ['kiwi', 'apple', 'banana']
sorted(words, key=lambda w: w[-1], reverse=True)
# sorts by last letter, Z to A
Task
Write sort_by_age(people) where people is a list of (name, age) tuples.
Return a new list sorted by age, youngest first. Don't change the
original list.
Test Suites
Pending
Stdout