[Tutor] nested os.popen()

[Jules Bravo]

I'm trying to create a program that can recreate the unix pipe. So basically 
I need to be able to take something like "ls *.py | du | wc" and be able to 
run it just like unix would, doing a wordcount of the du of all files that 
end with .py. My question is how would I do this without being able to 
create pipes that have both read and write capabilities.
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