[Distutils] Odd limitation in packaging/distutils2

[Paul Moore]

This seems odd...

PS D:\Data\PyPI> D:\Data\cpython\PCbuild\python -m packaging.run install nose
installing third-party projects from an uninstalled Python is not supported

And yet after downloading the nose source...

PS D:\Data\PyPI> bsdtar xzf D:\Downloads\Python\nose-1.1.2.tar.gz
PS D:\Data\PyPI> cd .\nose-1.1.2
PS D:\Data\PyPI\nose-1.1.2> D:\Data\cpython\PCbuild\python -m
packaging.run install
Installing from source directory: 'D:\\Data\\PyPI\\nose-1.1.2'
Downloading http://pypi.python.org/packages/source/d/distribute/distribute-0.6.14.tar.gz
Extracting in c:\users\gustav\appdata\local\temp\tmpecso_w
Now working in c:\users\gustav\appdata\local\temp\tmpecso_w\distribute-0.6.14
Building a Distribute egg in D:\Data\PyPI\nose-1.1.2
warning: no files found matching 'Makefile' under directory 'docs'
warning: no files found matching 'indexsidebar.html' under directory 'docs'
creating build
creating build\src
... etc

(The build actually failed, but for reasons unrelated to the fact that
it's an uninstalled Python, as far as I can see).

Why not allow installing direct from PyPI?

Paul.