I have now installed python3.8 from homebrew and relinked to this version. Now I get a little further. I can:

./pants run apps/app_a

. But when I try to

./pants package apps/a

I get this error:

Exception: String("Can only merge Directories with no duplicates, but found 3 duplicate entries in :\n\n`__init__.py`: 1.) file digest=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 size=0:\n\n\n\n`__init__.py`: 2.) file digest=c4f92a69e828f5701ffebac2959f704f9fe06ef3d559e146663cb14d44866416 size=1674:\n\n\"\"\"Helper classes for configuration management.\"\"\"\nimport os\n\n\nclass ModelConfig:\n    \"\"\"Model configuration class.\"\"\"\n\n    def __init__(\n        self, name: str, link: str, checksum: str, language_code=\"en\"\n    ):\n        self.fullname = name\n        self.link = link\n        self.language_code = language_code\n        self.checksum = checksum\n\n    def get_fullname(self):\n        \"\"\"\n\n        Returns\n        -------\n        Model fullname, i.e. \'<name_of_model>-<version>\'\n        \"\"\"\n        return self.fullname\n\n    def get_name(self):\n        \"\"\"\n\n        Returns\n        -------\n        model name without version\n\n        \"\"\"\n        return self.fullname.split(\"-\")[0]\n\n    def get_link(self):\n        \"\"\"\n\n        Returns\n        -------\n        model link\n        \"\"\"\n        return self.link\n\n    def get_language_code(self):\n        \"\"\"\n\n        Returns\n        -------\n        model language code\n        \"\"\"\n        return self.language_code\n\n    def get_version(self):\n        \"\"\"\n\n        Returns\n        --\n... TRUNCATED contents from 1674B to 1024B (Pass -ldebug to see full contents).\n\n`__init__.py`: 3.) file digest=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 size=0:\n\n")

I’ve not been able to understand what I’m doing wrong.