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I think this is a usage error. The problem is that
you run moduleX as a script. This puts the module's
directory as the first entry in sys.path (see
http://docs.python.org/dev/lib/module-sys.html#l2h-5058
for detais).
As a consequence, moduleX is recognised as a top
level module, not as part of a package.
If you want to test relative import, try opening an
interactive shell in the directory where `package`
resides, and type:
>>> from package.subpackage1 import moduleX
>>> moduleX.spam
'spam'