Python os.pipe () method
Python OS file / directory methods
Outline
os.pipe () method is used to create a pipeline Returns a pair of file descriptors (r, w) are read and write.
grammar
pipe () method syntax is as follows:
os.pipe()
parameter
no
return value
Returns the file descriptor right.
Examples
The following example demonstrates the use of pipe () method:
#!/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)
The above program output is:
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...