Cannot extract wranings/errors from ant script

[wikedkid]

Hi,

I have been learning python for about 4 months now and i'm stuck trying to extract errors/warnings after running an ant script.
I am running python 2.7 on a windows machine.
code snippet:

cmd = (r'{6} -f build.xml "-DthisInput={4}" "-Dargs.filter={2}"'
            ' "-DthisDoc={5}" "-Ddita.temp.dir={0}"'
            ' "-Dout={1}" {3} "-Dgenerate.outer.copy=3"'.format(
                tempDir, outDir, userFilter, ','.join(targets), file, filename, ant))
        pro = subprocess.Popen(
            cmd, shell=True,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE
        )
    pro.wait()
    o, e = pro.communicate()
    print (e)
    print (o)

An equivalent powershell script displays errors such as:
[gen-list] [DOTX008E][ERROR] File '..\topic\xyz\xyz.dita' does not exist or cannot be loaded.
[move-meta] File C:\Users\xyz\docs\temp\topic\xyz\xyz.xml does not exist

But my python script simply completes running the script without showing any warnings/errors.