I created a notebook demonstrating examples of running SPARQL queries against the Japan Search RDF store using Google Colab. I hope it serves as a useful reference when using RDF stores with Python.

https://colab.research.google.com/github/nakamura196/ndl_ocr/blob/main/ジャパンサーチのRDFストアを対象したSPARQLチュートリアル.ipynb

Other reference sites and tutorials include the following.

https://www.kanzaki.com/works/ld/jpsearch/

https://lab.ndl.go.jp/data_set/tutorial/