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execute pg_dump via python

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I am using zope on windows with an external python method to backup my 
database. I am struggling to run the following command:

pg_dump.exe database > file

I have tried using os.popen - no luck
and also subprocess.Popen.

eg:
import subprocess
        
subprocess.Popen(['c:/dir/dir/pg_dump.exe','database','>','c:/dir/dir/output 
file'])

The command string works perfectly in a terminal. Does anyone know how I 
should be doing this? I get no errors or traceback when I try the method 
through Zope.

regards
garry

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