and, or, not

Combine bools into bigger conditions:

a and b is True only if both are True
a or b is True if at least one is True
not a flips True and False

is_weekend = True
has_money = False
go_out = is_weekend and has_money   # False

Parentheses group a choice: (ticket or pass_holder) and not closed requires either credential and an open door.

See it run

lamp_on = True
battery_dead = True
works = lamp_on and not battery_dead
dim = lamp_on or battery_dead
print(works, dim)

Two bools, combined two different ways. Watch how and and or treat the same inputs.

Practice and, or, not

Exercise 1

With temp = 25, sunny = True, raining = False:

good_day = temp above 20 and sunny and not raining
stay_in = raining or temp below 0

Exercise 2

A museum admits visitors with a ticket or a pass, but never while closed. With ticket = False, pass_holder = True, closed = False, compute boolean admit using or, and and not.

Exercise 3

A download needs Wi-Fi or mobile permission, enough storage, and no pause. Use wifi = False, mobile_allowed = True, free_mb = 500, size_mb = 500, paused = False. Compute boolean can_download; an exact storage fit is allowed.

Free lesson: use the editor to practice it.

Practice

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Memory · names → values

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