Nick Coghlan added the comment:
The whole sys.path initialisation scheme is pretty broken when running from a
source checkout, so the short answer is "it won't work, and it isn't really
fixable in a maintenance release".
System Python 3:
sys.path = [
'/home/ncoghlan/devel/py3k',
'/usr/lib64/python33.zip',
'/usr/lib64/python3.3',
'/usr/lib64/python3.3/plat-linux',
'/usr/lib64/python3.3/lib-dynload',
'/home/ncoghlan/.local/lib/python3.3/site-packages',
'/usr/lib64/python3.3/site-packages',
'/usr/lib/python3.3/site-packages',
]
My source checkout:
sys.path = [
'/home/ncoghlan/devel/py3k',
'/usr/local/lib/python35.zip',
'/home/ncoghlan/devel/py3k/Lib',
'/home/ncoghlan/devel/py3k/Lib/plat-linux',
'/home/ncoghlan/devel/py3k/build/lib.linux-x86_64-3.5',
'/home/ncoghlan/devel/py3k/Modules',
'/home/ncoghlan/.local/lib/python3.5/site-packages',
]
We should probably have an explicit check for that in ensurepip so it bails out
as an unsupported operation rather than doing something weird. Looking in
sys.path for "os.path.join(os.path.dirname(sys.executable), 'Lib')" should be a
fairly reliable indicator that we're running from a source checkout.
Actually *fixing* it to do something sensible would require a lot of work on
the sys.path initialisation code, and I frankly consider that impractical given
the current state of getpath.c.
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