subprocess.Popen hangs at times?

[Kenneth McDonald]

When making calls of the form Popen(cmd, shell=True,  
stdout=subprocess.PIPE), we've been getting occasional, predictable  
hangs. Will Popen accumulate a certain amount of stdout and then block  
until its read? We don't want to use threads, so just want to read the  
entire stdout after the subprocess has finished.

Thanks,
Ken
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