Python method pipe() creates a pipe and returns a pair of file descriptors (r, w) usable for reading and writing, respectively
Following is the syntax for pipe() method −
This method returns a pair of file descriptors.
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)
When we run above program, it produces 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...