Python 3 - os.pipe() Method

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Description

The method pipe() creates a pipe and returns a pair of file descriptors (r, w) usable for reading and writing, respectively

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/python3
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)

Result

When we run the above program, it produces the following result −

The child will write text to a pipe and 
the parent will read the text written by child...
Parent reading
('text =', 'Text written by child...')
The child will write text to a pipe and 
the parent will read the text written by child...
Child writing
Child closing.