Call Signtool using python

[enda man]

Hi,

I want to call the Windows signtool to sign a binary from a python
script.

Here is my script:
//
os.chdir('./Install/activex/cab')
subprocess.call(["signtool", "sign", "/v", "/f", "webph.pfx", "/t",
"http://timestamp.verisign.com/scripts/timstamp.dll", "WebPh.exe" ])
//

But I am getting this error:
////
SignTool Error: The specified PFX password is not correct.

Number of files successfully Signed: 0
Number of warnings: 0
Number of errors: 1
Finished building plugin installer
scons: done building targets.
////


This python script is called as part of a scons build, which is also
python code.

Anyone seen this before or can pass on any ideas.
Tks,
EM