Python os.pipe () metode
Metode file / direktori Python OS
garis besar
Metode os.pipe () digunakan untuk membuat pipa Mengembalikan sepasang berkas deskriptor (r, w) yang membaca dan menulis.
tatabahasa
pipa () sintaks metode adalah sebagai berikut:
os.pipe()
parameter
tidak
Kembali Nilai
Mengembalikan file descriptor yang tepat.
contoh
Contoh berikut menunjukkan penggunaan metode pipa ():
#!/usr/bin/python # -*- coding: UTF-8 -*- import os, sys print "The child will write text to a pipe and " print "the parent will read the text written by child..." # file descriptors r, w for reading and writing r, w = os.pipe() processid = os.fork() if processid: # This is the parent process # Closes file descriptor w os.close(w) r = os.fdopen(r) print "Parent reading" str = r.read() print "text =", str sys.exit(0) else: # This is the child process os.close(r) w = os.fdopen(w, 'w') print "Child writing" w.write("Text written by child...") w.close() print "Child closing" sys.exit(0)
Output program di atas adalah:
The child will write text to a pipe and the parent will read the text written by child... Parent reading Child writing Child closing text = Text written by child...