Invoking a Python Script

To exemplify how to use this activity pack, we have built an automation process to invoke a Python script which defines two operations, Add and Subtract. One of the methods, Add, is then called from the script and given a list of integer variables as input parameters. The result, stored in a proprietary PythonObject variable, is then converted into a .NET datatype to be further used in Studio.

Note: The Python version you want to use has to be installed on the machine you want to run the process on.

This is how the demo can be built:

1. Open Studio and start a new Process.
2. Drag a Python Scope activity to the Workflow Designer.
3. Specify the installation directory of Python in the Path property of the Python Scope activity. By default, the location is %LOCALAPPDATA%\Programs\Python\PythonXX\python.exe, where XX is the Python version you are using.
4. Drag a Load Python Script activity in the Do section of the Python Scope and add the file path to the MathOperations.py Python script in the File property.
5. Create a new PythonObject variable, called MathFunctions and add it into the Result property field.

6. Add an Invoke Python Method activity and configure its properties as follows:

   • Input Parameters - {2,3}
   • Instance - Add the variable created at step 5, MathFunctions, to this field.
   • Name - Add the name of the method inside the script you want to use, in this case add.
   • Result - Create a new PythonObject variable, called SumResultPython, and add it to this property field.

7. Next, drag a Get Python Object activity to the workflow. Configure its properties as follows:

   • Python Object - Add the SumResultPython variable to this field.
   • TypeArgument - Select Int32 from the drop-down list.
   • Result - Create a new Int32 variable, called Result and add it to this field.
8. Add a Message Box activity at the end of the project and configure it to display the Result variable.

   Your project should look like this:

   
   

   

   
   

9. Run the process. The Message Box displays the result of the Add method.

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