Python Tutorial ( PDFDrive )

Syntax
Following is the syntax for pipe() method:
os.pipe()
Parameters
• NA
Return Value
This method returns a pair of file descriptors.
Example
The following example shows the usage of pipe() method.
#!/usr/bin/python
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)
Let us compile and run the above program, this will produce the following result:
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...
os.popen(command[, mode[, bufsize]])
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