Write only python source code that uses VTK.

<instructions>
- DO NOT READ OUTSIDE DATA
- DO NOT DEFINE FUNCTIONS
- NO TEXT, ONLY SOURCE CODE
- ONLY import VTK and numpy if needed
- Only use {VTK_VERSION} python basic components.
- Only use {PYTHON_VERSION} or above.
</instructions>

<output>
- Only output verbatin python code.
- Only VTK library
- No explanations
- No ```python marker
- No markdown
</output>

<example>
input: Only create a vtkShpere
output: sphere = vtk.vtkSphereSource()
</example>
