Python 多线程时，报错'应用程序调用一个已为另一线程整理的接口'，折腾我一晚上了

主要代码是这样的，采用多线程调用 process，process 再去调用其它函数

from multiprocessing.dummy import Pool as ThreadPool
import pythoncom
global wb
def process(r):
    sht = wb.sheets["开户案例"]
    sht.range((r,1)).value = '正在发送账户申请...'
    result = accinfo(wb, r)  #所在行，根据这个所在行，去进行后续操作
    sht.range((r,1)).value = result

pool = ThreadPool(5)
list_args=[]
for r in rows:
	list_args.append(r.row)

r1=pool.map(process, list_args)
pool.close()
pool.join()

提示的报错信息比较多

Traceback (most recent call last):
    r1=pool.map(process, list_args)
  File "C:\Users\zhangjw\AppData\Local\Programs\Python\Python36-32\lib\multiprocessing\pool.py", line 260, in map
    return self._map_async(func, iterable, mapstar, chunksize).get()
  File "C:\Users\zhangjw\AppData\Local\Programs\Python\Python36-32\lib\multiprocessing\pool.py", line 608, in get
    raise self._value
  File "C:\Users\zhangjw\AppData\Local\Programs\Python\Python36-32\lib\multiprocessing\pool.py", line 119, in worker
    result = (True, func(*args, **kwds))
  File "C:\Users\zhangjw\AppData\Local\Programs\Python\Python36-32\lib\multiprocessing\pool.py", line 44, in mapstar
    return list(map(*args))
  File "C:\Users\zhangjw\AppData\Local\Programs\Python\Python36-32\lib\site-packages\xlwings\main.py", line 649, in sheets
    return Sheets(impl=self.impl.sheets)
  File "C:\Users\zhangjw\AppData\Local\Programs\Python\Python36-32\lib\site-packages\xlwings\_xlwindows.py", line 454, in sheets
    return Sheets(xl=self.xl.Worksheets)
  File "C:\Users\zhangjw\AppData\Local\Programs\Python\Python36-32\lib\site-packages\xlwings\_xlwindows.py", line 116, in __getattr__
    v = getattr(self._inner, item)
  File "C:\Users\zhangjw\AppData\Local\Programs\Python\Python36-32\lib\site-packages\win32com\client\dynamic.py", line 516, in __getattr__
    ret = self._oleobj_.Invoke(retEntry.dispid,0,invoke_type,1)
pywintypes.com_error: (-2147417842, '应用程序调用一个已为另一线程整理的接口。', None, None)