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# Python2.x Python os.popen() Method [ Python OS File/Directory Methods](#) * * * ### Overview The os.popen() method is used to open a pipe from a command. Available on Unix and Windows. ### Syntax The syntax format of the **popen()** method is as follows: os.popen(command[, mode[, bufsize]]) ### Parameters * **command** -- The command to use. * **mode** -- The mode permission can be 'r' (default) or 'w'. * **bufsize** -- Indicates the buffer size required by the file: 0 means unbuffered; 1 means line buffered; other positive values indicate using a buffer of the parameter size (approximate value, in bytes). A negative bufsize means using the system default value. Generally, for tty devices, it is line buffered; for other files, it is fully buffered. If this parameter is not provided, the system default value is used. ### Return Value Returns an open file object with the file descriptor