'How to import a Jupyter notebook with spaces in the name or starting with a number?

How can I import a jupyter notebook which has spaces in the name or starting with a number? I know that is not a good standard to have spaces or numbers in the file names, but it's low effort for files to be ordered in a folder or in GitHub. I already tried different ways and blog posts but I cannot find any real solution.

Example: file to import = "4 linear algebra.ipynb" or "4_linear_algebra.ipynb"



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