Get count unique values in a row in pandas

Question

Suppose I have the following data frame:

0     1        2
new   NaN      NaN
new   one      one
a     b        c
NaN   NaN      NaN

How would I

Answer 1

Just use nunique(axis=1).

import numpy as np
import pandas as pd

data={0:['new','new','a',np.nan],
     1:[np.nan,'one','b', np.nan],
     2:[np.nan,np.nan,'c',np.nan]}
df = pd.DataFrame(data)

print(df.nunique(axis=1))

df['num_unique'] = df.nunique(axis=1)

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