# Invoking a Python Script

> To exemplify how to use this activity package, 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 data type to be further used in Studio.

To exemplify how to use this activity package, 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 data type 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 step-by-step guide is based on a default installation path of Python 3.12.
:::

This is how the demo can be built:

1. Open Studio and start a new **Process**.
2. Drag a **Multiple Assign** activity to the designer panel and add the following variables:
   * Add the `localAppDataPath` variable with the value to save `Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData)`.
   * Add the `pythonPath` variable with the value to save `localAppDataPath+"\Programs\Python\Python312\"`.
   * Add the `pythonLibraryPath` variable with the value to save `localAppDataPath+"\Programs\Python\Python312\python312.dll"`.
3. Add a **Log Message** activity to the workflow.
   * Add the `"The installation path of Python 3.12 was set as: " + pythonPath` expression in the **Message** field.
4. Add a **Python Scope** activity. To properly set up the **Python Scope** activity for Python 3.12, it is required to configure both the **Library path** and the **Path** properties.
   * Under the **Library path** property, enter the `pythonLibraryPath` variable created in the **Multiple Assign** activity.
   * Under the **Path** property, enter the `pythonPath` variable created in the **Multiple Assign** activity.
5. Drag a **Load Python Script** activity in the **Do** section of the **Python Scope**.
   * Add the file path to the `MathOperations.py` Python script in the **File** property.
   * Create a new `PythonObject` variable, called `mathOperations`, and add it into the **Result** property field.
6. Add an **Invoke Python Method** activity and configure its properties as follows:
   * **Input Parameters** - Add the `new Object() {2,3}` expression to this property field.
   * **Instance** - Add the `mathOperations` variable to this property 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. Add a **Get Python Object** activity and configure its properties as follows:
   * **PythonObject** - Add the `SumResultPython` variable to this property field.
   * **TypeArgument** - Select `Int32` from the drop-down list.
   * **Result** - Create a new `Int32` variable, called `sumResult`, and add it to this property field.
8. Add a **Message Box** activity at the end of the project and configure it to display the `sumResult` variable.

   Your project should look like this:

   ![docs image](https://dev-assets.cms.uipath.com/assets/images/activities/developer-docs-image-451499-56a9d5fa-c6709431.webp)

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

[Download example](https://docexamples.uipath.com/examples/Activities/Python%20v3.12%20-%20Invoking%20a%20script.zip)