python - Feed string to the first Popen when several Popen are chained -

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there answer how feed string popen using popen.communicate(intput=''). however, have problem of chaining several popen this:

p1 = popen(['fstcompile', '--isymbols=ascii.syms', '--osymbols=ascii.syms'], stdin=pipe, stdout=pipe) p2 = popen(['fstprint', '--isymbols=ascii.syms', '--osymbols=ascii.syms'], stdin=p1.stdout, stdout=pipe) p1.stdout.close()

i feed string stdin p1 , execute whole sequence.

i tried following:

p1.stdin.write('xxxx') p1.stdin.flush() print p2.communicate()[0]

and didn't work.

putting string p2.communicate()[0] makes no sense , didn't work anyway.

so what's right thing in such case?

thank in advance.


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