Summary  
This chapter covers how to declare, name, and assign values to variables in Python, illustrating dynamic typing and basic operations you can perform on variable data.  

General domain of usage  
Data analysis

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 TestExtraStudentsCalculation(unittest.TestCase):

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

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

    def test_correct_value_stored(self):
        import user_code
        expected_value = user_code.classes * user_code.students
        actual_value = user_code.total_students
        _dynamic_test(
            self,
            actual_value == expected_value,
            f"The `total_students` variable contains `{expected_value}`.",
            f"Expected `total_students` to be `{expected_value}`, but got `{actual_value}`."
        )

    def test_correct_value_stored(self):
        import user_code
        expected_value = user_code.total_students // 27
        actual_value = user_code.total_classes
        _dynamic_test(
            self,
            actual_value == expected_value,
            f"The `total_classes` variable contains `{expected_value}`.",
            f"Expected `total_classes` to be `{expected_value}`, but got `{actual_value}`."
        )

    def test_correct_total_students_stored(self):
        import user_code
        expected_value = user_code.classes * user_code.students
        actual_value = user_code.total_students
        _dynamic_test(
            self,
            actual_value == expected_value,
            f"The `total_students` variable contains `{expected_value}`.",
            f"Expected `total_students` to be `{expected_value}`, but got `{actual_value}`."
        )

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.

Challenge: Working with Variables

Solution