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Looks like this raises a specific ValueError now so it looks intentional that this shouldn't be supported I suppose. Closing but happy to reopen if I misunderstood
From SO:
http://stackoverflow.com/questions/24247255/idiomatic-multiindex-column-assignment-in-pandas/24247513#24247513
http://stackoverflow.com/questions/24258781/advanced-cross-section-with-multi-index-in-pandas
I think this could be make to work (its column creation)
df['Half'] = df['Val']/2
concat soln
Automatic broadcasting (but need to not 'align')
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