Nick Coghlan added the comment:
I'm suggesting we change this part of the bytecode emitted for "import x.y.z as
bar":
6 IMPORT_NAME 0 (x.y.z)
9 LOAD_ATTR 1 (y)
12 LOAD_ATTR 2 (z)
15 STORE_NAME 3 (bar)
to instead emit:
6 IMPORT_NAME 0 (x.y)
9 IMPORT_FROM 1 (z)
12 STORE_NAME 2 (bar)
15 POP_TOP
The degenerate case of "import x as y" would be unchanged, only cases which
currently emit LOAD_ATTR instructions would be modified.
I haven't looked at the practical details yet, but the key would be to use
IMPORT_FROM to do the name resolution, rather than LOAD_ATTR, thus enabling the
fallback to sys.modules for the eager lookup.
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<http://bugs.python.org/issue23203>
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