Hello World! This is my first post on the list and I'm hoping it is the right forum and not OT, I've searched a bit on this, but, none-the-wiser!
My question is on the Popen method, here is my snippet: p1 = Popen(["cat", "georgi_ddr7_allmag_kcor_in_test.dat"], stdout=PIPE ) > p2 = Popen(["fit_coeffs"], stdin=p1.stdout, stdout=PIPE) > p3 = Popen(["reconstruct_maggies"], stdin=p2.stdout,stdout=PIPE) > output_maggies_z=p3.communicate()[0] > > p1 = Popen(["cat", "georgi_ddr7_allmag_kcor_in_test.dat"], stdout=PIPE ) > p2 = Popen(["fit_coeffs"], stdin=p1.stdout, stdout=PIPE) > p4 = Popen(["reconstruct_maggies", "--band-shift", "0.1", "--redshift", > "0."], stdin=p2.stdout,stdout=PIPE) > output_maggies_z0=p4.communicate()[0] > > That is, p1 and p2 are the same, but p3 and p4 which they are passed to, are different. Is there a way to pass p1 and p2 to p3 AND p4 simultaneously, so as to not need to run p1 and p2 twice, as above? What arguments would I need to achieve this? NOTE: "georgi_ddr7_allmag_kcor_in_test.dat" is a very large file (~1E6 records) regards, - Sebastian
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