__import__('pkg_resources').declare_namespace(__name__)

文件:

project/
    setup.py
    proj_ex/
        __init__.py
        corecode.py
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>>pip install xxx
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安装包过程:
先找到setup.py

from setuptools import setup

setup(
    ...
    name_space_packages = ['proj_ex']
    ...
)
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name_space_packages 指向核心代码包:proj_ex

# __init__.py

__import__("pkg_resources").declare_namespace(__name__
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