Search notes:

/usr/lib/python3.x/EXTERNALLY-MANAGED

EXTERNALLY-MANAGED is a marker file that, if present, indicates that non-virtual-environment package installations are managed by some means external to Python (such a Linux distribution’s package manager).
This file is specified to live in the stdlib directory in the default sysconfig scheme, which marks the interpreter / installation as a whole (in Debian, the stdlib directory appears to be /usr/lib/python3.x).

See also

PEP 668 - Marking Python base environments as “externally managed”

Index

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