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When re-exporting entities from a package-level, always use the form import ... as ... even if the name is not changed, to signal static analysis tools that the name is intended to be re-exported (unless the aliased name starts with an underscore). This is enforceable with MyPy.

Do Excepting the above described case of package-level API re-export, do not import specific entities; instead, import only the module itself and then use verbose references, as shown below. If you really need to import a specific entity, consider prefixing it with an underscore to prevent scope leakage. Exception applies to well-encapsulated submodules which are not part of the package API (i.e., prefixed with an underscore) – you can import whatever you want provided that the visibility scope of the module is sufficiently narrow. Example: