Summary  
This chapter explains how to use the multiplication (*) and division (/) operators to perform arithmetic on numeric values, manage operator precedence, and print the results in code.

General domain of usage  
Scientific computing

import unittest
import importlib
import io
import re
from contextlib import redirect_stdout

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)

def normalize_text(text):
    text = text.lower()
    text = re.sub(r"\\s{2,}", " ", text)
    text = re.sub(r"\\s*([,:?])\\s*", r"\\1 ", text)
    return text.strip()

class TestCalculations(unittest.TestCase):
    def test_print_multiplication(self):
        import user_code
        f = io.StringIO()
        with redirect_stdout(f):
            importlib.reload(user_code)
        output = f.getvalue().strip().splitlines()
        if not output:
            _dynamic_test(
                self,
                False,
                "",
                "No output printed for multiplication"
            )
            return
        try:
            actual = float(output[0].strip())
        except Exception as e:
            _dynamic_test(
                self,
                False,
                "",
                f"Could not parse multiplication output as float: {e}"
            )
            return
        expected = 7.32 * 0.2
        condition = abs(actual - expected) <= 1e-6
        _dynamic_test(
            self,
            condition,
            f"Printed multiplication result {actual} is within tolerance",
            f"Expected multiplication result {expected}, got {actual}"
        )

    def test_print_division(self):
        import user_code
        f = io.StringIO()
        with redirect_stdout(f):
            importlib.reload(user_code)
        output = f.getvalue().strip().splitlines()
        if len(output) < 2:
            _dynamic_test(
                self,
                False,
                "",
                "No second line printed for division"
            )
            return
        try:
            actual = float(output[1].strip())
        except Exception as e:
            _dynamic_test(
                self,
                False,
                "",
                f"Could not parse division output as float: {e}"
            )
            return
        expected = 8.30 / 20
        condition = abs(actual - expected) <= 1e-6
        _dynamic_test(
            self,
            condition,
            f"Printed division result {actual} is within tolerance",
            f"Expected division result {expected}, got {actual}"
        )

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

test_main.py

Python is a high-level, interpreted, general-purpose programming
language. Distinguished from languages such as HTML, CSS, and JavaScript, which are mainly
utilized in web development, Python boasts versatility across multiple domains, including
software development, data science, and back-end development. This course will guide you
through Python's fundamental concepts, equipping you with the skills to create your own
functions by the conclusion of the program.

Python

In this section, you will explore the fundamentals of Python, get acquainted
with your workspace, perform simple math operations, and display your findings.

In this section, you'll discover how to save items such as numbers and text
in computer memory and retrieve them by name. Additionally, you'll gain an introduction to text
manipulation in Python.

In this section, you'll explore the boolean data type and learn how it is used
to develop programs that react to certain conditions.

In this section, you will continue learning about data types and discover
how to organize various attributes in a single variable using lists, tuples, and dictionaries.

In this section, you'll learn how to create loops in Python — an essential skill
for iterating through lists, tuples, and dictionaries.

To conclude this introductory course, you will explore some built-in
functions and then begin to develop your own!

Simple Math: Multiply & Divide

Requirements checklist

解答