python中Pywin32库如何使用？

pip install pywin32

import win32gui,win32ui,win32con

def get_windows(windowsname,filename):

      handle = win32gui.FindWindow(None,windowsname)

      win32gui.SetForegroundWindow(handle)

       hdDC = win32gui.GetWindowDC(handle)

       newhdDC = win32ui.CreateDCFromHandle(hdDC)

      saveDC = newhdDC.CreateCompatibleDC()

     saveBitmap = win32ui.CreateBitmap()

    left, top, right, bottom = win32gui.GetWindowRect(handle)

        width = right - left

    height = bottom - top

     saveBitmap.CreateCompatibleBitmap(newhdDC, width, height)

    saveDC.SelectObject(saveBitmap)

    saveDC.BitBlt((0, 0), (width, height), newhdDC, (0, 0), win32con.SRCCOPY)

    saveBitmap.SaveBitmapFile(saveDC, filename)

get_windows("PyWin32","截图.png")