Importing package with same base package name

问题

I have a large library I want to split up. There are packages: hdx.data hdx.facades hdx.utilities

I want to move hdx.utilities to a separate project hdx-python-utilities (on PyPi) and then add it as a requirement to the project with the packages hdx.data and hdx.facades (hdx-python-api). The problem is that I get ImportError: No module named 'hdx.utilities' when doing from hdx.utilities.session import get_session in the project hdx-python-api.

Is there any way to make this work in both Python 3+ and 2.7 (without renaming the top level package name hdx in either of them) allowing both hdx-python-api and hdx-python-utilities to work in any project that installs them?

回答1:

There are three ways of doing namespaced packages:

Native (Python 3.3)
pkgutil-style (Python 2 and 3, compatible to native)
pkg_resources-style (incompatible to the above, deprecated, not recommended)

The recommended way of doing namespaced packages for Python 2 and 3 are pkgutil-style namespace packages:

You would create the following for hpx-python-api

setup.py
hpx/
    __init__.py     # namespace init, see content below
    data/
        __init__.py
        ...
    facades/
        __init__.py
        ...

and the following for hpx-python-utilities

setup.py
hpx/
    __init__.py     # namespace init, see content below
    utilities/
        __init__.py
        ...

The two __init__.py files for the namespace package needs to contain only the following:

__path__ = __import__('pkgutil').extend_path(__path__, __name__)

来源：https://stackoverflow.com/questions/46685339/importing-package-with-same-base-package-name

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