Multi Thread
---------------
.. code-block:: python
    :caption: scripts/PYQT5/03_thread/02_multi_thread/main.py

    # -*- coding: utf-8 -*-

    import threading
    import time

    def print_numbers():
        for i in range(1, 11):
            print("Number {}".format(i))
            time.sleep(0.5)

    def print_letters():
        for letter in 'abcdefghij':
            print("Letter {}".format(letter))
            time.sleep(1)

    # 두 개의 스레드 생성
    thread1 = threading.Thread(target=print_numbers)
    thread2 = threading.Thread(target=print_letters)

    # 스레드 시작
    thread1.start()
    thread2.start()

    # 주 스레드에서 두 스레드가 종료될 때까지 기다림
    thread1.join()
    thread2.join()

    print("Done!")

Using the ``threading`` module, the ``print_numbers`` and ``print_letters`` functions are executed concurrently in separate threads.

- Both functions run simultaneously, resulting in numbers and letters being printed in an interleaved manner.

- ``thread1.join()`` and ``thread2.join()`` ensure the main thread waits until both of these threads complete.