Functions are created at run time

def and class are run-time Everything is runtime. Even compilation is runtime.

foo() will return a random value every time, but when bar is defined it freezes the specific value that foo returned when bar was created.

import random

def foo():
    return random.random()


print(foo())
print(foo())

def bar(a, b = foo()):
   return [a, b]

print(bar(1))
print(bar(2))

{% embed include file="src/examples/advanced-functions/runtime-def.out)