Import chains in Python

Question

If my foo.py is merely foo_var = 1 and bar.py is merely import foo, I know I can write baz.py that says from bar import foo_var, but should I? (Or should I instead do from foo import foo_var?)

Is there any reason why chaining imports like this would be bad?

Answer 1

No, it's fine. The first (from bar ...) compiles and runs both foo.py and bar.py while the latter (from foo ...) only compiles and runs foo.py, but if bar.py only contains import foo, the overhead is negligible.