Summary  
This chapter covers how to use Python’s arithmetic operators to perform addition, subtraction, multiplication, and division, how Python follows standard order of operations and how to override it with parentheses, and how to display results using printing.  

General domain of usage  
Numerical computations

Watch this video for a clear demonstration of how to perform basic math operations in Python. You'll see how to use addition, subtraction, multiplication, and division, and learn how Python evaluates expressions following standard math rules. This visual explanation will reinforce the concepts you've practiced so far.

Python excels at crunching numbers, supporting various mathematical operations from basic arithmetic to complex calculations.

# Addition
print(1039 + 948)

# Subtraction
print(10484 - 9274)

# Multiplication
print(116 * 99)

# Division
print(95873 / 472)

The `print()` function can be used to display results. Unlike text, mathematical expressions and numbers do not need to be enclosed in quotation marks (`"..."` or `'...'`).

Python follows standard math rules when performing calculations. You can combine different operations in a single expression and use parentheses to control the order. Try experimenting with various expressions.

import unittest
import importlib
import io
import re
import sys

def _dynamic_test(test_case, condition, success_message, failure_message):
    if condition:
        test_case._testMethodName = success_message
        test_case.assertTrue(True, success_message)
    else:
        test_case._testMethodName = failure_message
        test_case.fail(failure_message)

class TestUserCode(unittest.TestCase):

    def test_addition_operation_present(self):
        """
        Test to ensure the addition operation `2580 + 198` is present.
        """
        with open('user_code.py', 'r') as file:
            user_code_source = file.read()

        addition_check = re.search(r'2580\s*\+\s*198', user_code_source)

        _dynamic_test(
            self,
            addition_check is not None,
            "The addition operation `2580 + 198` is present.",
            "Expected the addition operation `2580 + 198` to be present."
        )

    def test_multiplication_operation_present(self):
        """
        Test to ensure the multiplication operation `23 * 42` is present.
        """
        with open('user_code.py', 'r') as file:
            user_code_source = file.read()

        multiplication_check = re.search(r'23\s*\*\s*42', user_code_source)

        _dynamic_test(
            self,
            multiplication_check is not None,
            "The multiplication operation `23 * 42` is present.",
            "Expected the multiplication operation `23 * 42` to be present."
        )

    def test_division_operation_present(self):
        """
        Test to ensure the division operation `1512 / 27` is present.
        """
        with open('user_code.py', 'r') as file:
            user_code_source = file.read()

        division_check = re.search(r'1512\s*/\s*27', user_code_source)

        _dynamic_test(
            self,
            division_check is not None,
            "The division operation `1512 / 27` is present.",
            "Expected the division operation `1512 / 27` to be present."
        )

    def test_correct_output_printed(self):
        import user_code
        captured_output = io.StringIO()
        sys.stdout = captured_output
        importlib.reload(user_code)
        sys.stdout = sys.__stdout__

        output = captured_output.getvalue().strip().split("\\n") 

        expected_outputs = ["2778", "966", "56.0"]

        for i, expected in enumerate(expected_outputs):
            _dynamic_test(
                self,
                output[i] == expected,
                f'The correct result `{expected}` is printed for operation {i + 1}.',
                f'Expected `{expected}` to be printed, but got `{output[i]}`.'
            )

if __name__ == '__main__':
    unittest.main()

test_main.py

Python is an interpreted high-level general-purpose programming language. Unlike HTML, CSS, and JavaScript, which are primarily used for web development, Python is versatile and can be used in various fields, including software development, data science, and back-end development. In this course, you'll explore the core aspects of Python, and by the end, you'll be crafting your own functions!

Dive into the basics of Python, explore your workspace, and perform simple math operations. Learn how to write readable code using comments and handle both basic and advanced mathematical expressions while displaying your results.

Perform Simple Math in Python

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