python AttributeError when attempting to save excel chart using PIL - python-imaging-library

Question

I am trying to save an chart from excel into a file, which I want to use later in a powerpoint presentation, but the code I am running keeps on coming up with
"AttributeError: 'NoneType' object has no attribute 'save'" .
Have been looking around google/stackoverflow but none of the suggestions I can find actually help, I keep on getting the error.
The code I am trying is below,
import win32com.client
import PIL
folder_path = r'C:/temp/Monthly_Graphs.xlsm'
xlApp = win32com.client.DispatchEx('Excel.Application')
wb = xlApp.Workbooks.Open(folder_path)
xlApp = win32com.client.DispatchEx('Excel.Application')
wb = xlApp.Workbooks.Open(folder_path)
wb.Sheets('Sheet1').Shapes('Sheet1_Pie_Chart').CopyPicture()
pie_image = PIL.ImageGrab.grabclipboard()
pie_image.savefig(r'C:/temp/pie_test.bmp','BMP')
the traceback is below
Traceback (most recent call last):
File "<ipython-input-12-b8e52c17e4d1>", line 1, in <module>
runfile('C:/python/stackoverflow_1.py', wdir='C:/python')
File "C:\Users\xxxxxxx\AppData\Local\conda\conda\envs\py64bit\lib\site-packages\spyder\utils\site\sitecustomize.py", line 710, in runfile
execfile(filename, namespace)
File "C:\Users\xxxxxxx\AppData\Local\conda\conda\envs\py64bit\lib\site-packages\spyder\utils\site\sitecustomize.py", line 101, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)
File "C:/python/stackoverflow_1.py", line 26, in <module>
pie_image.savefig(r'C:/temp/pie_test.bmp','BMP')
AttributeError: 'NoneType' object has no attribute 'savefig'

Answer 1

Managed to get it to work by referring to the below Q and setting the format of the CopyPicture line. Issue seems to be that excel default copy of the image is not in a format that PIL understands
Python Export Excel Sheet Range as Image
import win32com.client
from PIL import ImageGrab
import win32clipboard as clip
folder_path = r'C:/temp/Monthly_Graphs.xlsm'
xlApp = win32com.client.DispatchEx('Excel.Application')
wb = xlApp.Workbooks.Open(folder_path)
xlApp = win32com.client.DispatchEx('Excel.Application')
wb = xlApp.Workbooks.Open(folder_path)
wb.Sheets('Sheet1').Shapes('Sheet1_Pie_Chart').CopyPicture(Format=clip.CF_BITMAP)
pie_image = ImageGrab.grabclipboard()
pie_image.save(r'C:/temp/pie_test.bmp','BMP')