The `%` operator returns the remainder of dividing one number by another. For example, `5 % 2` returns **1**, since **2** fits into **5** twice with a remainder of **1**. This is useful for checking whether a number is even or odd.  

# Check if the number is even
print(1 % 2 == 0)  # False (odd)
print(2 % 2 == 0)  # True (even)
print(3 % 2 == 0)  # False (odd)

import unittest
import importlib
import re

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 TestEvenOddCheck(unittest.TestCase):

    def test_num_is_declared(self):
        import user_code
        _dynamic_test(
            self,
            hasattr(user_code, 'num'),
            "The `num` variable is declared.",
            "Expected `num` variable to be declared."
        )

    def test_result_is_declared(self):
        import user_code
        _dynamic_test(
            self,
            hasattr(user_code, 'result'),
            "The `result` variable is declared.",
            "Expected `result` variable to be declared."
        )

    def test_result_logic_correct(self):
        import user_code
        expected_value = "even" if user_code.num % 2 == 0 else "odd"
        actual_value = user_code.result
        _dynamic_test(
            self,
            actual_value == expected_value,
            f"The `result` variable contains `{expected_value}`.",
            f"Expected `result` to be `{expected_value}`, but got `{actual_value}`."
        )

    def test_if_else_statement_used(self):
        with open('user_code.py', 'r') as file:
            user_code_source = file.read()
        _dynamic_test(
            self,
            re.search(r'if', user_code_source) and re.search(r'else', user_code_source),
            "The `if-else` statement is used.",
            "Expected `if-else` statement to be used."
        )

    def test_modulo_operator_used(self):
        with open('user_code.py', 'r') as file:
            user_code_source = file.read()
        _dynamic_test(
            self,
            re.search(r'%', user_code_source),
            "The `%` operator is used for checking even/odd numbers.",
            "Expected `%` operator to be used for checking even/odd numbers."
        )

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!

Learn how to use comparison and logical operators, work with conditional expressions, and apply membership and type comparisons. Build a strong foundation in writing programs that respond dynamically to different conditions using if/else and if/elif/else structures.

Challenge: Creating Odd and Even Logic

Solution