Python Os.popen() Method



Python method popen() opens a pipe to or from command. The return value is an open file object connected to the pipe, which can be read or written depending on whether the mode is 'r' (default) or 'w'.The bufsize argument has the same meaning as in the open() function.


Following is the syntax for popen() method:

os.popen(command[, mode[, bufsize]])


  • command − This is the command used.
  • mode − This is the Mode that can be 'r'(default) or 'w'.
  • bufsize − If the buffering value is set to 0, no buffering will take place. If the buffering value is 1, line buffering will be performed while accessing a file. If you specify the buffering value as an integer greater than 1, then buffering action will be performed with the indicated buffer size. If negative, the buffer size is the system default(default behavior).

Return Value

This method returns an open file object connected to the pipe.


The following example shows the usage of popen() method.

# !/usr/bin/python

import os, sys

# using command mkdir
a = 'mkdir nwdir'

b = os.popen(a,'r',1)

print b

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

open file 'mkdir nwdir', mode 'r' at 0x81614d0

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