Recap Challenge - Lambda Sort
Part of the Logic & Flow section of Coddy's Python journey — lesson 59 of 78.
Lambda functions are incredibly useful with the sorted() function to customize sorting in different scenarios. Here are a few examples:
Sorting Strings by Length:
names = ["Alice", "Bob", "Charlie", "Diana"]
sorted_names = sorted(names, key=lambda x: len(x))
print(sorted_names)
# Output: ['Bob', 'Alice', 'Diana', 'Charlie']Sorting Dictionaries by Values:
grades = {"Alice": 85, "Bob": 90, "Charlie": 78}
sorted_grades = sorted(grades.items(), key=lambda x: x[1])
print(sorted_grades)
# Output: [('Charlie', 78), ('Alice', 85), ('Bob', 90)]Sorting Numbers by Absolute Value:
numbers = [-10, 15, -20, 25]
sorted_numbers = sorted(numbers, key=lambda x: abs(x))
print(sorted_numbers)
# Output: [-10, 15, -20, 25]Sorting Tuples by Multiple Criteria:
data = [("Alice", 25), ("Bob", 30), ("Charlie", 25)]
sorted_data = sorted(data, key=lambda x: (x[1], x[0]))
print(sorted_data)
# Output: [('Alice', 25), ('Charlie', 25), ('Bob', 30)]
Challenge
EasyCreate a function named sort_tuples that takes a list of tuples data as an argument. Each tuple in data contains two elements: a string and a number. The function should use the sorted() function along with a lambda function to sort the list of tuples based on the second element (the number) in ascending order. The function should return the sorted list of tuples.
Cheat sheet
Sorting Strings by Length:
names = ["Alice", "Bob", "Charlie", "Diana"]
sorted_names = sorted(names, key=lambda x: len(x))
print(sorted_names)
# Output: ['Bob', 'Alice', 'Diana', 'Charlie']Sorting Dictionaries by Values:
grades = {"Alice": 85, "Bob": 90, "Charlie": 78}
sorted_grades = sorted(grades.items(), key=lambda x: x[1])
print(sorted_grades)
# Output: [('Charlie', 78), ('Alice', 85), ('Bob', 90)]Sorting Numbers by Absolute Value:
numbers = [-10, 15, -20, 25]
sorted_numbers = sorted(numbers, key=lambda x: abs(x))
print(sorted_numbers)
# Output: [-10, 15, -20, 25]Sorting Tuples by Multiple Criteria:
data = [("Alice", 25), ("Bob", 30), ("Charlie", 25)]
sorted_data = sorted(data, key=lambda x: (x[1], x[0]))
print(sorted_data)
# Output: [('Alice', 25), ('Charlie', 25), ('Bob', 30)]Try it yourself
def sort_tuples(data):
# Write code here
Test yourselfThis lesson includes a short quiz. Start the lesson to answer it and track your progress.
All lessons in Logic & Flow
1Variables Exploration
ConstantsMultiple Variable AssignmentsSwapping VariablesPlaceholder VariablesRound NumbersList Casting4Contact Book Application
Display MenuAdd Contact
View ContactEdit ContactDelete ContactList AllEverything Together7Sets Part 2
Mathematical Operations Part 1Mathematical Operations Part 2Recap - Treasure HuntSubsets and SupersetsIterating Over SetsRecap - Tournament Tracker2Dictionaries Part 1
What is a Dictionary?Creating a DictionaryAccessing ValuesModifying DictionariesRecap - Recipe Manager5Advanced Decision Making
Ternary OperatorMembership ChecksIdentity ChecksIndentation ErrorsRecap - Vacation Filter8Student Records Manager
Project OverviewAdd StudentAdd GradeIs EnrolledAverage GradeList by CourseTop Students11Advanced Functions
Returning Multiple ValuesLambda Functions Part 1Lambda Functions Part 2Recap Challenge - Lambda SortRecursive Functions Part 1Recursive Functions Part 2Recap - Sum Nested List14Higher-Order Functions
The Map FunctionThe Filter FunctionRecap - Email ValidatorRecap - Number Processor3Dictionaries Part 2
Dictionary MethodsNested DictionariesChecking for KeysLooping Through DictionariesRecap - Frequency Counter9Advanced Data Aggregation
Using SumFinding Minimum and MaximumSorting Data EfficientlyRecap - Dictionary Sorter