And, Or, Not

Lesson

And, Or, Not

Three operators combine booleans.

and is True only when both sides are True:

print(5 > 3 and 2 > 1)
print(5 > 3 and 2 > 9)

Output:

True
False

or is True when at least one side is True:

print(5 > 9 or 2 > 1)
print(5 > 9 or 2 > 9)

Output:

True
False

not flips a boolean:

print(not 5 > 9)

Output:

True

Combined conditions read directly in an if or a return:

def can_vote(age, is_citizen):
    return age >= 18 and is_citizen

Exercise

An amusement park ride admits a rider who is at least 140 cm tall and at least 10 years old. A rider accompanied by an adult is admitted at any height, as long as they are at least 10.

Define a function named can_ride with three parameters: height, age, and with_adult.
Return True when the rider is admitted under the rules above, otherwise False.

can_ride(150, 12, False) returns True. can_ride(120, 12, False) returns False. can_ride(120, 12, True) returns True.

Run your code to see the output, then press Submit.

Tests

import unittest


class TestCanRide(unittest.TestCase):
    def test_tall_enough_and_old_enough(self):
        self.assertIs(can_ride(150, 12, False), True)

    def test_too_short_without_an_adult(self):
        self.assertIs(can_ride(120, 12, False), False)

    def test_too_short_but_with_an_adult(self):
        self.assertIs(can_ride(120, 12, True), True)

    def test_too_young_even_with_an_adult(self):
        self.assertIs(can_ride(150, 8, True), False)

    def test_exactly_at_both_limits(self):
        self.assertIs(can_ride(140, 10, False), True)

Solution

def can_ride(height, age, with_adult):
    return age >= 10 and (height >= 140 or with_adult)


print(can_ride(150, 12, False))
print(can_ride(120, 12, False))
print(can_ride(120, 12, True))

Solution hidden. Give it a real try first.

Discussion

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main.py

Console

Press Run to execute your code, or Submit to test and complete this problem.