I ahve the following python file that I am running as an external method in Zope.

def backup():
   import  os
os.popen("c:/scholarpack/postgres/bin/pg_dump scholarpack > c:/scholarpack/ancillary/scholarpack.sql")
   data=open('c:/scholarpack/ancillary/scholarpack.sql','r')
   r=data.read()
   data.close
   return r

However, when I run this script it creates the file scholarpack.sql but the file is empty.
Any help much appreciated.
Regards
Garry

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