Pandas rank by multiple columns

Question

I am trying to rank a pandas data frame based on two columns. I can rank it based on one column, but how can to rank it based on two columns? \'SaleCount\', then \'TotalReve

Answer 1

The generic way to do that is to group the desired fiels in a tuple, whatever the types.

df["Rank"] = df[["SaleCount","TotalRevenue"]].apply(tuple,axis=1)\
             .rank(method='dense',ascending=False).astype(int)

df.sort_values("Rank")

   TotalRevenue        Date  SaleCount shops  Rank
1          9000  2016-12-02        100    S2     1
5          2000  2016-12-02        100    S8     2
3           750  2016-12-02         35    S5     3
2          1000  2016-12-02         30    S1     4
7           600  2016-12-02         30    S7     5
4           500  2016-12-02         20    S4     6
9           500  2016-12-02         20   S10     6
0           300  2016-12-02         10    S3     7
8            50  2016-12-02          2    S9     8
6             0  2016-12-02          0    S6     9