This patch allows pyExcelerator output to file-like oobjects
like StringIO. Nice voe Webapplications.
  --md@hudora.de

Index: pyExcelerator/CompoundDoc.py
===================================================================
--- pyExcelerator/CompoundDoc.py	(revision 1166)
+++ pyExcelerator/CompoundDoc.py	(revision 1171)
@@ -546,7 +546,10 @@
         self.__build_sat()
         self.__build_header()
         
-        f = file(filename, 'wb')
+        if hasattr(filename, 'write'):
+            f = filename
+        else:
+            f = file(filename, 'wb')
         f.write(self.header)
         f.write(self.packed_MSAT_1st)
         f.write(stream)
@@ -554,7 +557,6 @@
         f.write(self.packed_MSAT_2nd)
         f.write(self.packed_SAT)
         f.write(self.dir_stream)
-        f.close()
 
 
 if __name__ == '__main__':