this module let' reuse the simple writer and reader scripts we wrote earlier to demonstratec:\pp \system\streamstype writer py print("helphelpi' being repressed!"print( :\pp \system\streamstype reader py print('got this"% "input()import sys data sys stdin readline()[:- print('the meaning of life is'dataint(data code like the following can both read from and write to the reader script--the pipe object has two file-like objects available as attached attributesone connecting to the input streamand one to the output (python users might recognize these as equivalent to the tuple returned by the now-defunct os popen )pipe popen('python reader py'stdin=pipestdout=pipepipe stdin write( 'lumberjack\ ' pipe stdin write( ' \ ' pipe stdin close(output pipe stdout read(pipe wait( output 'got this"lumberjack"\ \nthe meaning of life is \ \nas we'll learn in we have to be cautious when talking back and forth to program like thisbuffered output streams can lead to deadlock if writes and reads are interleavedand we may eventually need to consider tools like the pexpect utility as workaround (more on this laterfinallyeven more exotic stream control is possible--the following connects two programsby piping the output of one python script into anotherfirst with shell syntaxand then with the subprocess modulec:\pp \system\streamspython writer py python reader py got this"helphelpi' being repressed!the meaning of life is :\pp \system\streamspython from subprocess import popenpipe popen('python writer py'stdout=pipep popen('python reader py'stdin= stdoutstdout=pipeoutput communicate()[ output 'got this"helphelpi\' being repressed!"\ \nthe meaning of life is \ \np returncode standard streams