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 TestDistanceConversion(unittest.TestCase):

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

    def test_distance_in_kilometers_value_correct(self):
        import user_code
        expected_value = 4677.4
        actual_value = user_code.distance_in_kilometers
        _dynamic_test(
            self,
            actual_value == expected_value,
            f"The `distance_in_kilometers` variable contains `{expected_value}`.",
            f"Expected `distance_in_kilometers` to be `{expected_value}`, but got `{actual_value}`."
        )

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

    def test_distance_in_miles_value_correct(self):
        import user_code
        expected_value = user_code.distance_in_kilometers / 1.609
        actual_value = user_code.distance_in_miles
        _dynamic_test(
            self,
            abs(actual_value - expected_value) < 0.01, 
            f"The `distance_in_miles` variable contains `{expected_value}`.",
            f"Expected `distance_in_miles` to be `{expected_value}`, but got `{actual_value}`."
        )

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

    def test_int_distance_in_miles_value_correct(self):
        import user_code
        expected_value = int(user_code.distance_in_miles)
        actual_value = user_code.int_distance_in_miles
        _dynamic_test(
            self,
            actual_value == expected_value,
            f"The `int_distance_in_miles` variable contains `{expected_value}`.",
            f"Expected `int_distance_in_miles` to be `{expected_value}`, but got `{actual_value}`."
        )

    def test_int_distance_in_miles_is_integer(self):
        import user_code
        _dynamic_test(
            self,
            isinstance(user_code.int_distance_in_miles, int),
            "The `int_distance_in_miles` variable is of type `int`.",
            "Expected `int_distance_in_miles` to be of type `int`."
        )

    def test_division_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 division `/` operator is used for conversion.",
            "Expected the division `/` operator to be used for conversion."
        )

    def test_int_function_used(self):
        with open('user_code.py', 'r') as file:
            user_code_source = file.read()
        _dynamic_test(
            self,
            re.search(r'int\s*\(', user_code_source),
            "The `int()` function is used to convert `distance_in_miles` to an integer.",
            "Expected the `int()` function to be used to convert `distance_in_miles` to an integer."
        )

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.

Learn how to store and manage data in Python by working with numbers, text, and variables. Understand how to assign values, follow naming conventions, and explore different data types. Gain hands-on experience with string operations, indexing, slicing, and memory recall techniques to efficiently manipulate text in Python.

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.

Expand your understanding of data types by learning how to group multiple attributes within a single variable. Explore lists, tuples, and dictionaries to efficiently store and manage structured data, along with essential methods for manipulation and retrieval.

Master the art of writing loops in Python—essential constructs for iterating over lists, tuples, dictionaries, and other data structures. Learn to use while and for loops effectively, explore the range function, and work with nested loops to handle complex iteration patterns.

Explore essential built-in functions in Python and take the next step by creating your own. Learn how to define functions, use conditional logic, modify existing functions, and work with lambda expressions to write efficient, reusable code.

Which of these is a correct way to create a variable?

How do you store the text `"Hello"` in a variable named `greeting`?

Which of these variable names is valid in Python?

What is the correct way to output `"c<>definity"` in the console?

How can you convert the string `"123"` to an integer?

What will happen when the following code is executed?

Challenge: Converting Kilometers to Miles

解答