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は、インタプリタ型の高水準汎用プログラミング言語です。HTML、CSS、JavaScriptが主にウェブ開発に使用されるのに対し、Pythonは多用途であり、ソフトウェア開発、データサイエンス、バックエンド開発など様々な分野で利用できます。本コースでは、Pythonの主要な側面を探求し、最終的には独自の関数を作成できるようになります。

Pythonの基本を深く学び、作業スペースを探索し、簡単な数学演算を実行します。コメントを使用して可読性の高いコードを書く方法を学び、基本的および高度な数学式を扱いながら結果を表示します。

チャレンジ：変数の操作

解答