I want to assign the output of a command I run using os.system
to a variable and prevent it from being output to the screen. But, in the below code ,the output is sent to the screen and the value printed for var
is 0, which I guess signifies whether the command ran successfully or not. Is there any way to assign the command output to the variable and also stop it from being displayed on the screen?
var = os.system("cat /etc/services") print var #Prints 0
os. system() method execute the command (a string) in a subshell. This method is implemented by calling the Standard C function system(), and has the same limitations. If command generates any output, it is sent to the interpreter standard output stream.
Description. 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 mode is 'r' (default) or 'w'. The bufsize argument has the same meaning as in open() function.
From "Equivalent of Bash Backticks in Python", which I asked a long time ago, what you may want to use is popen
:
os.popen('cat /etc/services').read()
From the docs for Python 3.6,
This is implemented using subprocess.Popen; see that class’s documentation for more powerful ways to manage and communicate with subprocesses.
Here's the corresponding code for subprocess
:
import subprocess proc = subprocess.Popen(["cat", "/etc/services"], stdout=subprocess.PIPE, shell=True) (out, err) = proc.communicate() print "program output:", out
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