def f(x, y = 2):
    return x + y

def g(x, y = 2):
    pass

def h(x, y = 2):
    return None

type(None)

NoneType

g(3)

h(3, y = 10)

f(3, y = 10)

13

s = 0
for i in range(12):
    s += i
s

66

l = [1, 2, 3]
for li in l:
    print(li)

1
2
3

l + [2]

[1, 2, 3, 2]