Wie kann ich einen zeilenweisen Rang in

import pandas as pd
df = pd.DataFrame({"ID":[1,2,3,4], "a":[2,7,9,10], 
                   "b":[6,7,4,2], "c":[3,4,8,5]})
print(df)
#    ID   a  b  c
# 0   1   2  6  3
# 1   2   7  7  4
# 2   3   9  4  8
# 3   4  10  2  5
df[["a","b","c"]] = df[["a","b","c"]].rank(method="min", 
                                           ascending=False, 
                                           axis=1).astype("int")
print(df)
#    ID  a  b  c
# 0   1  3  1  2
# 1   2  1  1  3
# 2   3  1  3  2
# 3   4  1  3  2