# \#vtkpythonalgorithmba

**URL:** https://discourse.vtk.org/tag/vtkpythonalgorithmba/32.md

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## [How to access information from a custom reader and read only a subset of data?](https://discourse.vtk.org/t/how-to-access-information-from-a-custom-reader-and-read-only-a-subset-of-data/15082)

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**Author:** [@scotsman60](https://discourse.vtk.org/u/scotsman60)\
**Replies:** 0\
**Last updated:** [December 28, 2024, 4:03pm UTC](https://discourse.vtk.org/t/how-to-access-information-from-a-custom-reader-and-read-only-a-subset-of-data/15082 "2024-12-28T16:03:53Z")

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Hello!! I’ve written a custom reader based on vtkPythonAlgorithmBase following the pattern from this blog written by Ben Geveci. The file that I’m reading may contain one or more spatial data fields I want to use this…