# How to use the SelectExamples
**URL:** https://discourse.vtk.org/t/how-to-use-the-selectexamples/8756
**Category:** Support
**Tags:** python
**Created:** [June 17, 2022, 11:54am UTC](https://discourse.vtk.org/t/how-to-use-the-selectexamples/8756 "2022-06-17T11:54:59Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Dwight98](https://discourse.vtk.org/u/Dwight98)
#### Post date: [June 17, 2022, 11:54am UTC](https://discourse.vtk.org/t/how-to-use-the-selectexamples/8756/1 "2022-06-17T11:54:59Z")
I want to use the SelectExamples to look through some examples about vtk class which i need,but i don’t know where can modify the vtk\_class and language,I ran the official example code directly and got the following error feedback:error: the following arguments are required: vtk\_class, language.
so,what can i do
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### Author:  [@amaclean](https://discourse.vtk.org/u/amaclean)
#### Post date: [June 18, 2022, 10:52am UTC](https://discourse.vtk.org/t/how-to-use-the-selectexamples/8756/2 "2022-06-18T10:52:09Z")
The two positional parameters that you must specify are the VTK class and language e,g. `vtkPolyData Cxx`, there are also some optional parameters.
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### Author:  [@Dwight98](https://discourse.vtk.org/u/Dwight98)
#### Post date: [June 23, 2022, 6:09am UTC](https://discourse.vtk.org/t/how-to-use-the-selectexamples/8756/3 "2022-06-23T06:09:42Z")
> [@amaclean](#):
>
> 您必须指定的两个位置参数是 VTK 类和语言，例如，还有一些可选参数。
where i can specify they two in official example？（in python language）
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### Author:  [@amaclean](https://discourse.vtk.org/u/amaclean)
#### Post date: [June 23, 2022, 8:14am UTC](https://discourse.vtk.org/t/how-to-use-the-selectexamples/8756/4 "2022-06-23T08:14:04Z")
Try `vtkPolyData` and `Python` as parameters e.g.:
`python3 SelectExamples.py vtkPolyData Python`.
For help try:
`python3 SelectExamples.py -h`