Why Does My Conda Environment Load Non-Conda Packages First, and How Can I Fix It?

Unexpected Python Paths in Conda Environment: Understanding Prioritization and Solutions

Introduction:
In a Conda environment, the order of directories in the Python path can be surprising, with local non-Conda paths appearing before their Conda counterparts. This can lead to conflicts, as packages installed outside Conda may override those within.

Explanation:
This behavior is intentional and follows the specifications of PEP 370. The site module appends the user site directory to the system path prior to appending the Conda environment site-packages. This is because users may prefer to prioritize user-installed packages over system-wide installations.

Options:
There are several ways to prevent user-level packages from being loaded before Conda packages:

• Environment Variable: Set the PYTHONNOUSERSITE environment variable to 1, which will disable the loading of user-level site-packages.
• Python -s Flag: Use the Python binary's -s flag, which explicitly disables user-level site-packages.
• Remove User-Level Installations: Remove any user-level Python folders to eliminate potential conflicts.
• Conda Forge Package: Install the conda-ecosystem-user-package-isolation package, which automatically sets PYTHONNOUSERSITE=1 during environment activation.
• Alternative Packages: Install the merv::envvar-pythonnousersite-true package to set PYTHONNOUSERSITE=1 or the merv::envvar-pythonpath-null package to clear PYTHONPATH.

By understanding the reasons behind the default path prioritization and leveraging these options, you can customize your Conda environment to suit your specific needs and avoid package conflicts.

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