[Python] What is the file structure for a python project when a package is installed?

Can you help me understand if, for the most part, Python package managers follow the same file structure when installing a package? For example, when dep_1 is installed, we can expect the following files and directories are created under site_packages directory:

• sample-project
• lib
• python3
• site-packages
  • dep_1-2.25.1.dist-info
  • dep_1
  • __init__.py

I've tried this installation for pip and wondering if this is something we can expect for all python package managers?

I've also tried running pip install google_cloud_bigquery and discovered that there are namespace package which are sometimes used for Python ver 3 and above. The file structure then became:

• sample-project
• lib
• python3
• site-packages
  • dep_1-2.25.1.dist-info
  • namespace-package-for-dep_1
    • dep_1
      • __init__.py

In our google_cloud_bigquery example, /site_packages/google_cloud_bigquery-version.dist-info/top_level.txt file that tells me the namespace package is google. But from What is top_level.txt and when is it created?, we cannot expect this file reliably. So then, my 2nd question is how else can I reliably find where to retrieve the namespace package?

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