import: overriding import builtin? relevant: "modules/fasten" pypi import structure potential: module_1 module_2 module_3 module_3 module_4 module_2 modules_pypi modules_pypi module_1 1.0.0 module_2 1.0.4 module_1 -> modules_pypi/module_1/1.0.0 module_2 -> modules_pypi/module_1/1.0.4