python openpyxl excel file reading error

问题

I am writing a xlsm(macro enabled excel) file with openpyxl.load_workbook. but sometimes it is giving the following error

Sample code in script:

from openpyxl import load_workbook
wb =load_workbook(filename = 'F:\Reports\asdf.xlsm')

Error Details

File "C:\Python27\lib\site-packages\openpyxl\worksheet\header_footer.py", line 209
warn("""Cannot parse header or footer so it will be ignored""")
UserWarning: Cannot parse header or footer so it will be ignored

来源：https://stackoverflow.com/questions/31583401/python-openpyxl-excel-file-reading-error