You should use ExportAsFixedFormat
instead SaveAs
. Documentation for this function you can find here. This function can be used with a win32 and a comtypes.
win32com example
import win32com.client
visio = win32com.client.Dispatch("Visio.Application")
doc = visio.Documents.Open('map.vsd')
doc.ExportAsFixedFormat( 1, 'map.pdf', 1, 0 )
comtypes example
import comtypes.client as coms
visio = coms.CreateObject('Visio.Application')
doc = visio.Documents.Open('map.vsd')
doc.ExportAsFixedFormat( 1, 'map.pdf', 1, 0 )