Numbers

Lesson

Numbers

Python has two kinds of numbers. An int is a whole number: 4, -12, 5400000. A float is a number with a decimal point: 4.0, 12.5, -0.25.

The basic arithmetic operators are +, -, * (multiplication), and / (division):

price = 12.5
tickets = 4
total = price * tickets
print(total)

Output:

50.0

Division with / always produces a float, even when the result is a whole number:

print(10 / 2)

Output:

5.0

Operators follow the usual order of operations: * and / before + and -. Parentheses override the order:

print(2 + 3 * 4)
print((2 + 3) * 4)

Output:

14
20

Exercise

Create ticket_price holding 12.5.
Create tickets holding 4.
Create total by multiplying the two variables. Do not write 50.0 directly.
Create remaining holding 100 - total.
Print total and remaining.

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

Tests

import unittest


class TestNumbers(unittest.TestCase):
    def test_ticket_price_is_12_point_5(self):
        self.assertEqual(ticket_price, 12.5)

    def test_tickets_is_4(self):
        self.assertEqual(tickets, 4)

    def test_total_is_50(self):
        self.assertEqual(total, 50.0)

    def test_remaining_is_50(self):
        self.assertEqual(remaining, 50.0)

Solution

ticket_price = 12.5
tickets = 4
total = ticket_price * tickets
remaining = 100 - total

print(total)
print(remaining)

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.