python - Libraries imported in one .py doesnt work for imported functions of anothers .py

Question

Hope you can help me on this, here is the problem: I'm working in "x.py" in which I have imported a lot of functions from another file named "functions.py".

Also, I have some specific functions in other files (s1.py,s2.py lets say...), which I also called in my x.py.

The problem comes when I try to use a function or library from functions.py in order to help me with those specifics files where I have other functions (s1.py, s2.py). They just simply dont recognize the libraries which I already imported... ???

Work around I've been using: declare the libraries needed directly in s1.py and s2.py, but I don't like it to much, it seems like I'm duplicating that code.

Is there any way to get my s1.py and s2.py to recognize the imported libraries in x.py???

question from:https://stackoverflow.com/questions/65946598/libraries-imported-in-one-py-doesnt-work-for-imported-functions-of-anothers-py

Answer 1

Importing a module does not import all its imports by default. You do need to import functions in s1 and s2 even if you are already doing import x.

Or alternatively, you could do from x import functions inside s1 and s2. But personally I'm not sure if I would ever do that - it obfuscates things a bit, and one might say that code duplication is not a thing in the case of imports. Maybe it would make sense on a conceptual level: we import functions via x because the functions are specific to x. But in such case I would make x a package and put functions in that package (in which case the import statement would incidentally look the same). But if functions is not specific to x, i.e. it is expected to be useful for various modules unrelated to x, then don't import it via x.

If you're concerned about the performance impact of multiple imports, this explains that there is none.