# invoking python CLI module from command line
**URL:** https://discourse.slicer.org/t/invoking-python-cli-module-from-command-line/3369
**Category:** Support
**Created:** [July 3, 2018, 7:03pm UTC](https://discourse.slicer.org/t/invoking-python-cli-module-from-command-line/3369 "2018-07-03T19:03:06Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@tjbertram](https://discourse.slicer.org/u/tjbertram)
#### Post date: [July 3, 2018, 7:03pm UTC](https://discourse.slicer.org/t/invoking-python-cli-module-from-command-line/3369/1 "2018-07-03T19:03:06Z")
Operating system: macOS 10.13.2 (High Sierra)
Slicer version: 4.8.1
Expected behavior: able to invoke python CLI module from command line
Actual behavior: not able to invoke python CLI module from command line
Greetings - I am trying to create a python CLI module, following the specification given in
[https://www.slicer.org/wiki/Documentation/Nightly/Developers/SlicerExecutionModel/Python](https://www.slicer.org/wiki/Documentation/Nightly/Developers/SlicerExecutionModel/Python)
I have created the file myPythonCLImodule.py, which includes the XML and Execute() method as specified at the URL above. I have also created the directory and added the path to the settings as specified in the instruction (also in the URL above):
“To create a working Python CLI module, just create a directory, put your .py file there and add the directory path to the path list in Application settings - Module settings.”
I then try to invoke this python CLI module from the command line, as follows
./Slicer myPythonCLImodule
but nothing happens.
My question is: How do I invoke a python CLI module from the command line?
I assume that one does not need to rebuild Slicer, or run Slicer from the slicer/superbuild directory, in order to run a python CLI module - is this correct?
I should also point out, just for reference, that the following command line is working just fine for me:
./Slicer --no-main-window --python-script /tmp/test.py
This is not my problem. My problem is how to invoke my own python CLI module from the command line.
Thanks in advance for any assistance you can provide.
---
### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [July 3, 2018, 10:30pm UTC](https://discourse.slicer.org/t/invoking-python-cli-module-from-command-line/3369/2 "2018-07-03T22:30:03Z")
Hi -
Thanks for pointing that out - the documentation on that wiki page was vague. It says Slicer3 but didn’t indicate that things are different in Slicer 4. I added a big warning at the top with a pointer to this example with a python CLI that works with the current Slicer 4.9 (Nightly Preview) version:
> **[SlicerRadiomics/SlicerRadiomicsCLI at master · AIM-Harvard/SlicerRadiomics](https://github.com/AIM-Harvard/SlicerRadiomics/tree/master/SlicerRadiomicsCLI)**
>
> master/SlicerRadiomicsCLI