BUG: Raise TypeError when converting mixed-type DataFrames, use proper NA types, close #1282#1283

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lbeltrame wants to merge 6 commits intopandas-dev:masterfrom lbeltrame:r-dataframe

+55-5

Commits on May 8, 2012

Commits on May 9, 2012

Merge branch 'master' into r-dataframe
lbeltrame
committed

Commits on May 21, 2012

Commits on May 22, 2012

BUG: Use NA types for better conversion, and refuse matrix conversions
lbeltrame
committed