When I call an external .exe program in Python, how can I get printf output from the .exe application and print it to my Python IDE?
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3 Answers
To call an external program from Python, use the subprocess module.
The subprocess module allows you to spawn new processes, connect to their input/output/error pipes, and obtain their return codes.
An example from the doc (output is a file object that provides output from the child process.):
output = subprocess.Popen(["mycmd", "myarg"], stdout=subprocess.PIPE).communicate()[0]
A concrete example, using cmd, the Windows command line interpreter with 2 arguments:
>>> p1 = subprocess.Popen(["cmd", "/C", "date"],stdout=subprocess.PIPE)
>>> p1.communicate()[0]
'The current date is: Tue 04/14/2009 \r\nEnter the new date: (mm-dd-yy) '
>>>
6 Comments
unwind
No, don't use os.popen(), it's been obsoleted by subprocess.
Fred Larson
No, 'myarg' is argument to the command 'mycmd'. You can pass an environment using the 'env' keyword argument. Give it a dictionary containing the environment you want to use.
0fnt
use subprocess.Popen([.....], stdout=..., env="YOUR ENV DICTIONARY") See: stackoverflow.com/questions/2231227/…
Phil-ZXX
In Python 3 you may want to use
...communicate()[0].decode() to get the the actual string output, and not the byte output. |
I am pretty sure that you are talking about Windows here (based on the phrasing of your question), but in a Unix/Linux (including Mac) environment, the commands module is also available:
import commands
( stat, output ) = commands.getstatusoutput( "somecommand" )
if( stat == 0 ):
print "Command succeeded, here is the output: %s" % output
else:
print "Command failed, here is the output: %s" % output
The commands module provides an extremely simple interface to run commands and get the status (return code) and the output (reads from stdout and stderr). Optionally, you can get just status or just output by calling commands.getstatus() or commands.getoutput() respectively.
1 Comment
tssch
The answer above applies to python2, in python3 getstatusoutput and getoutput can be found in subprocess.
you can use subprocess.check_output(['mycmd', 'myargs'])
Example:
import subprocess
print(subprocess.check_output(['ls', '-1']).decode())
