>>> import pyautogui
    >>> screenWidth, screenHeight = pyautogui.size()
    >>> currentMouseX, currentMouseY = pyautogui.position()
    >>> pyautogui.moveTo(100, 150)
    >>> pyautogui.click()
    >>> pyautogui.moveRel(None, 10)  # move mouse 10 pixels down
    >>> pyautogui.doubleClick()
    >>> pyautogui.moveTo(500, 500, duration=2, tween=pyautogui.tweens.easeInOutQuad)  # use tweening/easing function to move mouse over 2 seconds.
    >>> pyautogui.typewrite('Hello world!', interval=0.25)  # type with quarter-second pause in between each key
    >>> pyautogui.press('esc')
    >>> pyautogui.keyDown('shift')
    >>> pyautogui.typewrite(['left', 'left', 'left', 'left', 'left', 'left'])
    >>> pyautogui.keyUp('shift')
    >>> pyautogui.hotkey('ctrl', 'c')

    >>> import pyautogui
    >>> pyautogui.alert('This is an alert box.')
    'OK'
    >>> pyautogui.confirm('Shall I proceed?')
    'Cancel'
    >>> pyautogui.confirm('Enter option.', buttons=['A', 'B', 'C'])
    'B'
    >>> pyautogui.prompt('What is your name?')
    'Al'
    >>> pyautogui.password('Enter password (text will be hidden)')
    'swordfish'

    >>> import pyautogui
    >>> im1 = pyautogui.screenshot()
    >>> im1.save('my_screenshot.png')
    >>> im2 = pyautogui.screenshot('my_screenshot2.png')

    >>> import pyautogui
    >>> button7location = pyautogui.locateOnScreen('button.png') # returns (left, top, width, height) of matching region
    >>> button7location
    (1416, 562, 50, 41)
    >>> buttonx, buttony = pyautogui.center(button7location)
    >>> buttonx, buttony
    (1441, 582)
    >>> pyautogui.click(buttonx, buttony)  # clicks the center of where the button was found

    >>> import pyautogui
    >>> buttonx, buttony = pyautogui.locateCenterOnScreen('button.png') # returns (x, y) of matching region
    >>> buttonx, buttony
    (1441, 582)
    >>> pyautogui.click(buttonx, buttony)  # clicks the center of where the button was found