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Functions · Lesson 14 of 56

Lambda

Source: 4-Functions/4.3-Lambda.ipynb

Start here — no coding background needed

What you will learn

One-line mini-functions for quick jobs.

In simple words

Lambda is shorthand when the logic fits in one expression — optional until comfortable with `def`.

Think of it like this

Sticky note function instead of a full recipe card.

Write a recipe once, use it many times — functions save repetition.

Easy example — try this first

Easy example — run this first. Change values and press Run again.

Python

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference notes (from full bootcamp)

Optional — deeper detail for when you are ready

Lambda Functions in Python

Lambda functions are small anonymous functions defined using the lambda keyword. They can have any number of arguments but only one expression. They are commonly used for short operations or as arguments to higher-order functions.

Reference example
Python

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
5

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
11

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
True

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
True

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
39

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
39

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
4

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
[1, 4, 9, 16, 25, 36]

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Practice test — try yourself

Write code, press Check. Wrong answer shows the correct code to copy & run.

Use lambda to double 7 and print the result (should print 14).

Python