link several Popen commands with pipes

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I think you want to instantiate two separate Popen objects here, one for ‘ls’ and the other for ‘sed’. You’ll want to pass the first Popen object’s stdout attribute as the stdin argument to the 2nd Popen object.

Example:

p1 = subprocess.Popen('ls ...', stdout=subprocess.PIPE)
p2 = subprocess.Popen('sed ...', stdin=p1.stdout, stdout=subprocess.PIPE)
print p2.communicate()

You can keep chaining this way if you have more commands:

p3 = subprocess.Popen('prog', stdin=p2.stdout, ...)

See the subprocess documentation for more info on how to work with subprocesses.

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