Answers for "how do i create an app like pyautogui does?"

pyautogui install

pip3 install pyautogui

how to make pyautogui type a full sentence

>>> pyautogui.write('Hello world!')                 # prints out "Hello world!" instantly
>>> pyautogui.write('Hello world!', interval=0.25)  # prints out "Hello world!" with a quarter second delay after each character