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I want to run a programme located in C, which can be run using command line using a line as follows

tclsh oommf.tcl avf2odt -average space -axis z -onefile  <filename>.txt  -headers none -ipat *.omf

This is the only thing I need to type in command line.

How can I run it using python?

Please be VERY relevant to the question. I have seen a lot of answers like: you can use 'subprocess' to realize it. However, none of them really solves the problem.

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    Please be very specific about what you have tried. Commented May 29, 2014 at 2:34
  • 1
    subprocess is very relevant to the question. Commented May 29, 2014 at 2:37
  • And please be very specific about how the answers to this question and your previous question do not solve your problem. It seems you have left out quite a lot of detail. Commented May 29, 2014 at 3:19
  • Hi all, thanks for your suggestions(and some critics) To specify my problem, what I wish to achieve is using only python to run a command, as written in the code above, which can be run within command line. If this is still not specified enough, I shall list out all the procedure: 1 open command line 2 type in the line I wrote above 3 press Enter to execute That's all Now I want to achieve in Python. I have searched an solution by myself, as below import os os.system("<whatever command to be executed>") Commented May 29, 2014 at 7:39
  • I am new to programming and that's why I need detailed explanation on 'subprocess', despite that I do know it can solve the problem. I even don't know what 'shell' is and you can imagine I may not be capable to describe the question in a skilled programmer's tone. Commented May 29, 2014 at 7:39

2 Answers 2

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You can use subprocess module.

import subprocess
subprocess.call(["tclsh", "oommf.tcl", "avf2odt", "-average", "space", "-axis", "z", "-onefile",  "<filename>.txt", "-headers", "none", "-ipat", "*.omf"])

See https://docs.python.org/2/library/subprocess.html#subprocess.call

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3 Comments

This is actually incorrect; you would pass separate arguments in the list, not one long string.
You're right; edited it.
All the more surprising your answer was marked as accepted before..
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This should do the trick (returns the process's printed output as a String)

import subprocess
output = subprocess.check_output("tclsh oommf.tcl avf2odt -average space -axis z -onefile  <filename>.txt  -headers none -ipat *.omf", shell=True)

If you want the subprocess's return code instead (for example to check for 0 on success) use

import subprocess
return_code = subprocess.call("tclsh oommf.tcl avf2odt -average space -axis z -onefile  <filename>.txt  -headers none -ipat *.omf", shell=True)
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1 Comment

Don't use shell=True where splitting up the arguments into a list of separate strings lets you avoid using the extra shell process altogether.

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