exercism: complete plane-tickets (generate + assign + codes OK)

[nanaelie]

plane-tickets Exercise - Solution

This pull request contains a full implementation of the "Conda Airlines" exercise from the Exercism Python track.

✔️ Implemented Functions

• generate_seat_letters(number): Yields seat letters from A to D in loop.
• generate_seats(number): Yields seat numbers like 1A, 1B..., skipping row 13.
• assign_seats(passengers): Assigns a seat to each passenger in order.
• generate_codes(seat_numbers, flight_id): Generates unique 12-character ticket codes.

✅ Tests

All 8 test cases pass with pytest:

$ pytest generators_test.py
============================= test session starts =============================
platform linux -- Python 3.11.2, pytest-7.2.1
collected 8 items

generators_test.py ........ [100%]
============================== 8 passed in 0.02s ==============================

[github-actions]

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[kotp]

Not approved, forum discussion is here PR author misunderstood the intent of the repository.