Else

Lesson

Else

else adds a block that runs when the if condition is False:

def entry_fee(age):
    if age < 18:
        return 50
    else:
        return 120

print(entry_fee(12))
print(entry_fee(30))

Output:

50
120

Exactly one of the two blocks runs. else has no condition of its own — it covers every case the if did not.

When both blocks return, the else can be dropped: code after a return inside the if only runs when the condition was False.

def entry_fee(age):
    if age < 18:
        return 50
    return 120

Both versions behave identically. Use whichever you find clearer.

Exercise

Define a function named shipping_cost with one parameter, order_total.
If order_total is 500 or more, return 0 — shipping is free.
Otherwise, return 59.

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

Tests

import unittest


class TestShippingCost(unittest.TestCase):
    def test_600_ships_free(self):
        self.assertEqual(shipping_cost(600), 0)

    def test_200_costs_59(self):
        self.assertEqual(shipping_cost(200), 59)

    def test_exactly_500_ships_free(self):
        self.assertEqual(shipping_cost(500), 0)

    def test_499_costs_59(self):
        self.assertEqual(shipping_cost(499), 59)

Solution

def shipping_cost(order_total):
    if order_total >= 500:
        return 0
    else:
        return 59


print(shipping_cost(600))
print(shipping_cost(200))

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.