Control

Expressions evaluate to values
Statements perform actions

print(print('1'), print('2'))

1
2
None None

Boolean Expressions

T and F

False values: False, None, 0, ‘’
True values: everything else

Operators

and, or, not

True and 5 + 2 and 8

8

False or print('hi') or True

hi
True

False or True or print('hi') 

True

While statements

def fib(n):cur, nxt = 0, 1k = 0while k < n:cur, nxt = nxt, cur + nxtk += 1return cur