commands not found when file extension is .txt but it works with .sage

[Tovo]

I have sage 9.5 on Ubuntu 22.04/22.10.

I have the following code inside my files

delta=simplicial_complexes.RandomComplex(4,1)
print(delta.facets())

If the file is named as test.sage, the program works fine.

If the file is named as test.txt, the program outputs

delta=simplicial_complexes.RandomComplex(4,1)
NameError: name 'simplicial_complexes' is not defined

Why does this happen?

[Dima Pasechnik]

this is because .sage files are pre-processed (turned into .py files,
roughly speaking) on the fly,
before being run.

HTH
Dima

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[Tovo]

Thanks for the explanation.