Brett Cannon <br...@python.org> added the comment: Modules/getpath.c seems to be where the C code does it when getting paths for sys.path. So it would be possible to use that same algorithm to set some sys attribute (e.g. in_checkout or something) much like sys.gettotalrefcount is optional and only shown when built with --with-pydebug. Otherwise some directory structure check could be done (e.g. find importlib/_bootstrap.py off of sys.path, and then see if ../Modules/Setup or something also exists that would never show up in an installed CPython).
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