index max pandas

# importing pandas as pd 
import pandas as pd 
  
# Creating the dataframe  
df = pd.DataFrame({"A":[4, 5, 2, None], 
                   "B":[11, 2, None, 8],  
                   "C":[1, 8, 66, 4]}) 
  
# Skipna = True will skip all the Na values 
# find maximum along column axis 
df.idxmax(axis = 1, skipna = True)