鼠标拖动报错,一直在网上找不到答案,求大神支招

按照书上描述麻了如下代码,居然报错了,报错了,报错了。一直百度不得其解,故上来问问大神
系统是osX,该下的模块以及依赖包都下好,就是有问题。
代码如下:

import pyautogui, time
time.sleep(5)
pyautogui.click()
distance = 200
while distance >0:
    pyautogui.dragRel(distance, 0, duration=0.2)
    distance = distance - 5
    pyautogui.dragRel(0, distance, duration=0.2)
    pyautogui.dragRel(-distance, 0, duration=0.2)
    distance = distance - 5
    pyautogui.dragRel(0, -distance, duration=0.2)


报错如下

Traceback (most recent call last):
  File "/Users/jibohe/exercise.py", line 11, in <module>
    pyautogui.dragRel(distance,0,duration=0.2)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pyautogui/__init__.py", line 944, in dragRel
    _mouseMoveDrag('drag', mousex, mousey, xOffset, yOffset, duration, tween, button)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pyautogui/__init__.py", line 1053, in _mouseMoveDrag
    platformModule._dragTo(tweenX, tweenY, button)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pyautogui/_pyautogui_osx.py", line 436, in _dragTo
    assert False, "button argument not in ('left', 'middle', 'right')"
AssertionError: button argument not in ('left', 'middle', 'right')
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hebeer
hebeer
2019/09/24 16:24
  • python
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