import unittest
import user_code

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 TestBusAnnouncements(unittest.TestCase):
    def test_single_iteration(self):
        """Checks that the generator returns stops in order during one cycle"""
        stops = ["Stop A", "Stop B", "Stop C"]
        announcer = user_code.bus_announcements(stops)
        
        expected_output = ["Next stop: Stop A", "Next stop: Stop B", "Next stop: Stop C"]
        result = [next(announcer) for _ in range(len(stops))]
        
        condition = result == expected_output
        failure_message = f"For input {stops}, expected {expected_output}, but got {result}."
        _dynamic_test(self, condition, "The generator correctly cycles through stops once.", failure_message)
    
    def test_multiple_iterations(self):
        """Checks that the generator loops through stops continuously"""
        stops = ["Stop X", "Stop Y"]
        announcer = user_code.bus_announcements(stops)
        
        expected_output = ["Next stop: Stop X", "Next stop: Stop Y", "Next stop: Stop X", "Next stop: Stop Y"]
        result = [next(announcer) for _ in range(len(stops) * 2)]
        
        condition = result == expected_output
        failure_message = f"For input {stops}, expected {expected_output}, but got {result}."
        _dynamic_test(self, condition, "The generator correctly cycles through stops continuously.", failure_message)
  

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

test_main.py

You'll have a solid grasp of how important functions are in Python, no matter your field in computer science. We'll cover creating functions, defining arguments, handling return values, and exploring their use in Python.

We will consider what a function in Python and some basic techniques used to create functions is: what are the arguments of the function, what is the return value of the function, what is the body of the function, and how to use the function in the code.

Learn how to define functions in Python using positional and optional arguments. Master the flexibility of creating functions that adapt to different input scenarios.

Learn to work with arbitrary arguments and keyword arguments in Python to handle variable numbers of inputs. Understand how arbitrary arguments manage flexible positional inputs and how keyword arguments organize named arguments into a dictionary for efficient function design.

The return value of a function is the direct result of the execution of the function, which we can use in the program. There are several types of function return values - we will consider the most commonly used.

Explore the power of recursion and lambda functions in Python. Understand how recursion allows a function to call itself for solving complex problems, and how lambda functions provide a concise way to define anonymous functions for simple tasks.

Challenge: Automated Bus Announcements

Solution

Challenge: Automated Bus Announcements

Solution