Get max value from row of a dataframe in python

This is my dataframe df

a     b     c
1.2   2    0.1
2.1   1.1  3.2
0.2   1.9  8.8
3.3   7.8  0.12

I'm trying to get max value from each row of a dataframe, I m expecting output like this

max_value
   2
  3.2
  8.8
  7.8 

This is what I have tried

df[len(df.columns)].argmax()

I'm not getting proper output, any help would be much appreciated. Thanks