workbook.custom_document_properties allows me to add new properties, but does not find the existing properties in the Excel file
doc_properties = workbook.custom_document_properties
len(doc_properties) is 0
doc_properties.add(‘TEST’ , ‘TEST’) # OK
len(doc_properties) is 1
i = doc_properties.index_of(‘TEST’)
doc_properties[i].value = ‘after you alphonse’ #OK
but it doesn’t see all the properties that are already in the file.