python - Rank elements in a data frame while keeping index -

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i'm using following formula gather top 20 elements each row in data frame. works great dropping index column df_returns i'd keep them. using dates index in df_returns data frame , i'd have same dates corresponding new data in df_rank data frame. 

df_rank = pd.dataframe({n: df_returns.t[col].nlargest(21).index.tolist() n, col in enumerate(df_returns.t)}).t

for example, let's wanting top 3 following data frame:

             b   c   d   e 1/1/2014   5   4   6   8   1 2/1/2014   2   1   6   3   1 3/1/2014   8   2   3   5   1

the results i'm getting are:

0   d   c   1   c   d   2     d   c

the results i'd are:

1/1/2014   d   c   2/1/2014   c   d   3/1/2014     d   c

you use set_index set index of new dataframe original one:

df_rank.set_index(df_returns.index)

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