Single Thread
---------------

.. code-block:: python
    :caption: scripts/PYQT5/03_thread/01_single_thread/main.py

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

    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)

    # 함수 순차 실행
    print_numbers()
    print_letters()

    print("Done!")

In this example, two functions, ``print_numbers`` and ``print_letters``, are called sequentially to print numbers and letters.

- Each function prints numbers or characters at specified time intervals, and this example demonstrates sequential execution.