def testDf():
    data = {'int':[1,2,3],'float':[1./3,2.5,3.5],'string':['a','b','c'],'nan':[np.nan,np.nan,np.nan]}
    return DataFrame(data, index=Index(['AAA','BBB','CCC']))[['int','float','string','nan']]
creates test dataframe
dataset/ETHPy150Open cmorgan/trading-with-python/lib/qtpandas.py/testDf