Summary  
Demonstrates how to control flow in nested loops by using a break statement to exit the inner loop early when a condition is met.

General domain of usage  
Travel expense processing

Let's apply the concepts of `break` and `continue` to analyze travel costs practically. We'll combine a `while` loop and a `for` loop to process expenses across multiple trips.

Imagine you have multiple trips, and each trip has a list of expenses. If any expense exceeds a specific budget threshold, we will stop processing that trip immediately.

# List of trips with their respective expenses
travel_costs = [
    [100, 150, 300, 50],   # Trip 1
    [200, 500, 100, 80],   # Trip 2
    [120, 180, 400, 150]   # Trip 3
]

# Budget threshold
budget = 200

# Outer while loop to iterate through trips
i = 0
while i < len(travel_costs):
    print(f"Processing expenses for Trip {i + 1}:")
    
    # Inner for loop to iterate through expenses
    for cost in travel_costs[i]:
        # If expense exceeds the budget
        if cost > budget:  
            print('Expense', cost, 'exceeds the budget. Stopping this trip.')
            break
        print('Expense:', cost)
    
    i += 1  # Move to the next trip
    print('')  # Add a new line for readability

- **Outer loop**: iterates through the list of trips using the index `i`;
- **Inner loop**: processes each expense in the current trip;
- `break` **in the inner loop**:
if an expense exceeds the `budget`, the `break` statement stops processing expenses for the current trip.

import unittest
import importlib

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 TestUserCode(unittest.TestCase):

    def test_significant_expenses_is_declared(self):
        try:
            user_code = importlib.import_module("user_code")
            _ = user_code.significant_expenses
            _dynamic_test(self, True, "The `significant_expenses` list is declared.", "")
        except AttributeError:
            _dynamic_test(self, False, "", "Expected `significant_expenses` to be declared.")
        except ImportError as e:
            self.fail(f"Failed to import module: {e}")

    def test_significant_expenses_correct_values(self):
        try:
            user_code = importlib.import_module("user_code")
            expected_expenses = [
                next((cost for cost in trip if cost > 200), None)
                for trip in user_code.travel_costs
            ]
            _dynamic_test(
                self,
                user_code.significant_expenses == expected_expenses,
                "The `significant_expenses` list contains correctly identified values.",
                f"Expected `significant_expenses` to be `{expected_expenses}`, but got `{user_code.significant_expenses}`."
            )
        except AttributeError:
            _dynamic_test(self, False, "", "Expected `significant_expenses` to be declared.")
        except ImportError as e:
            self.fail(f"Failed to import module: {e}")

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

test_main.py

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break/continue in a Nested Loop

Solution