1) What do I need to do?
🎯 Your mission: Sound the alarm
Make a function called alarm that prints 3 lines of alarm messages.
Call it twice.
2) What do I need to know?
def makes a new command
A function is a set of instructions with a name. You've used built-in ones like print() and len().
With def you can invent your own! def hero_entrance(): — then indent the lines that belong to it.
Defining it doesn't run it. You call it by writing its name with brackets: hero_entrance()
🧰 Your toolkit for this mission
Everything you need to know to finish this lesson on your own:
Function
A named set of instructions you can use again and again.
How to write it: def name(): then indent the instructions underneath.
def alarm():
print("ALERT!")
print("Villain spotted!")Calling a function
Defining only teaches Python. Calling actually runs it.
How to write it: Write the name with brackets, not indented: alarm().
alarm() alarm()
Order
Define a function before you call it.
How to write it: Put def blocks near the top of your code.
Think about it
Look at this code. What happens next, and why? Say it in your own words.
zap() zap()
Watch & explore ▶
Power-up: def makes a new command
See it happen
1 / 3def zap():
print("Zap!")def teaches Python a new command. It does not run the recipe yet.
3) Run the code & terminal output
Hero TerminalPress ▶ RUN and your program's messages appear here!
Captain Py
Our next adventure is yours to create.