TST: getting column from and applying op to a df should commute
TST: getting column from and applying op to a df should commute

analogue to test_panel.test_arith which does the same for panel/frame
as this does for frame/series.

linebp/pandas,kdebrab/pandas,rs2/pandas,Winand/pandas,harisbal/pandas,linebp/pandas,nmartensen/pandas,pratapvardhan/pandas,kdebrab/pandas,cbertinato/pandas,nmartensen/pandas,kdebrab/pandas,DGrady/pandas,pandas-dev/pandas,winklerand/pandas,zfrenchee/pandas,harisbal/pandas,rs2/pandas,nmartensen/pandas,DGrady/pandas,pandas-dev/pandas,DGrady/pandas,MJuddBooth/pandas,gfyoung/pandas,cython-testbed/pandas,winklerand/pandas,winklerand/pandas,jorisvandenbossche/pandas,jreback/pandas,nmartensen/pandas,gfyoung/pandas,toobaz/pandas,datapythonista/pandas,pratapvardhan/pandas,jorisvandenbossche/pandas,datapythonista/pandas,amolkahat/pandas,jorisvandenbossche/pandas,jorisvandenbossche/pandas,pratapvardhan/pandas,dsm054/pandas,louispotok/pandas,winklerand/pandas,datapythonista/pandas,louispotok/pandas,louispotok/pandas,gfyoung/pandas,amolkahat/pandas,cbertinato/pandas,MJuddBooth/pandas,Winand/pandas,kdebrab/pandas,harisbal/pandas,GuessWhoSamFoo/pandas,Winand/pandas,jmmease/pandas,DGrady/pandas,DGrady/pandas,amolkahat/pandas,gfyoung/pandas,TomAugspurger/pandas,winklerand/pandas,MJuddBooth/pandas,jreback/pandas,cbertinato/pandas,MJuddBooth/pandas,Winand/pandas,jreback/pandas,jmmease/pandas,cython-testbed/pandas,toobaz/pandas,datapythonista/pandas,TomAugspurger/pandas,jmmease/pandas,GuessWhoSamFoo/pandas,linebp/pandas,pratapvardhan/pandas,GuessWhoSamFoo/pandas,rs2/pandas,toobaz/pandas,jreback/pandas,cython-testbed/pandas,jmmease/pandas,pandas-dev/pandas,rs2/pandas,dsm054/pandas,zfrenchee/pandas,louispotok/pandas,MJuddBooth/pandas,toobaz/pandas,zfrenchee/pandas,TomAugspurger/pandas,linebp/pandas,Winand/pandas,kdebrab/pandas,winklerand/pandas,amolkahat/pandas,harisbal/pandas,TomAugspurger/pandas,gfyoung/pandas,zfrenchee/pandas,DGrady/pandas,dsm054/pandas,nmartensen/pandas,linebp/pandas,Winand/pandas,cbertinato/pandas,pratapvardhan/pandas,GuessWhoSamFoo/pandas,harisbal/pandas,GuessWhoSamFoo/pandas,amolkahat/pandas,cython-testbed/pandas,dsm054/pandas,nmartensen/pandas,linebp/pandas,louispotok/pandas,cython-testbed/pandas,zfrenchee/pandas,dsm054/pandas,pandas-dev/pandas,toobaz/pandas,jmmease/pandas,cbertinato/pandas,jmmease/pandas,jreback/pandas