Lambda

Main idea

Lambda is a small anonymous one-expression function.

Tip

Use for tiny transforms only.

Watch out

Unreadable complex lambdas.

Read this next

Lambda is used in many real programs. Right now you are in Functional Programming.

Core idea:
Lambda is a small anonymous one-expression function.

Read the example code on this page. Then write your own short version.

Tip:
Use for tiny transforms only.

Watch out for:
Unreadable complex lambdas.

Your challenge:
Sort tuple list by second item using lambda.

Use the editor in the challenge lab. When your output looks correct and there is no error, press the green button to unlock the next topic.

Example code

Copy this example if it helps. Change it so it matches Lambda.

# Topic: Lambda
def main():
    sample = "edit me"
    # TODO: apply Lambda concept here
    result = sample
    print("Result:", result)

if __name__ == "__main__":
    main()

Challenge

Sort tuple list by second item using lambda.

Before you can finish: your output should include at least 16 characters; at least 1 non-empty line(s); no crash traceback—fix errors until the program runs cleanly.

Use Run. Read the output. Change your code until the task is done.

Starter reference

# Challenge starter for Lambda
def solve():
    # Write your solution here
    pass

print("Update solve() and run")

Your code

The first Run may load Python in your browser (one-time). Later runs are faster.

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