Functions

Definitions, arguments, returns, and lambdas.

01Simple function

main.py

def greet(name):
    return f"Hello, {name}!"

print(greet("World"))

Output

Hello, World!

02Default arguments

Try it Online

main.py

def power(base, exp=2):
    return base ** exp

print(power(5))
print(power(2, 10))

Output

25
1024

03Keyword arguments

Try it Online

main.py

def describe(name, age, city="Unknown"):
    return f"{name}, {age}, from {city}"

print(describe(age=30, name="Eve"))
print(describe("Tom", 25, city="Berlin"))

Output

Eve, 30, from Unknown
Tom, 25, from Berlin

04Variable arguments (*args, **kwargs)

Try it Online

main.py

def report(*args, **kwargs):
    print("args:", args)
    print("kwargs:", kwargs)

report(1, 2, 3, name="Ada", role="dev")

Output

args: (1, 2, 3)
kwargs: {'name': 'Ada', 'role': 'dev'}

05Lambda function

Try it Online

main.py

square = lambda x: x * x
print(square(6))

nums = [1, 2, 3, 4]
print(list(map(lambda n: n * 10, nums)))

Output

36
[10, 20, 30, 40]

06Recursion (factorial)

Try it Online

main.py

def fact(n):
    return 1 if n <= 1 else n * fact(n - 1)

print(fact(6))

Output