Why Does My Conda Environment Prioritize Locally Installed Packages Over Environment Packages?

Unexpected Python Paths in Conda Environment

Problem Statement:

In a Conda environment, the unexpected order of directories in the Python path leads to the prioritization of packages installed in non-Conda local paths over those installed in the Conda environment.

Explanation:

This behavior is documented in PEP 370. The site module appends the user site to the sys.path before appending the prefix site. This prioritization allows users to prioritize packages installed at the user level over those installed at the system level.

Options for Avoidance:

To avoid this prioritization, several options are available:

1. Environment Variable: Set PYTHONNOUSERSITE=1 to toggle the loading of user-level site-packages.
2. Python -s Flag: Engage the -s flag to explicitly disable the loading of user-level site-packages.
3. User-Level Install Removal: Remove the ~/.local/lib/python* folders from the system to prevent future user-level installs.

4. Automated Conda Environment Variable:

   • Install the conda-ecosystem-user-package-isolation package from Conda Forge to automatically set PYTHONNOUSERSITE=1 during environment activation.
   • Alternatively, install the merv::envvar-pythonnousersite-true or merv::envvar-pythonpath-null packages to set specific environment variables.

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