Isnan is not supported for the input types Python Imputer

Question

import numpy as np
import matplotlib.pyplot as plt
import pandas as pd

#Import Data set

dataset= pd.read_csv('Data.csv') 
X = dataset.iloc[:,:-1].values
Y = dataset.iloc[:,3].values

#Taking Care of The Missing Data
from sklearn.preprocessing import Imputer

imputer = Imputer(missing_values='nan',strategy='mean',axis=0)
imputer = imputer.fit(X[:,1:3])

X[:,1:3] = imputer.transform(X[:,1:3])

I was following this tutorial series and did exactly as he tutor did with me of course having this error as mentioned in the code. A potential solution would be of course very helpful. Thanks in advance.

 Error : if value_to_mask == "NaN" or np.isnan(value_to_mask): TypeError: ufunc 'isnan' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule ''safe'' 

Answer 1

try :

imputer = Imputer(missing_values=np.nan,strategy='mean',axis=0)

or

imputer = Imputer(missing_values='NaN',strategy="mean",axis=0)

as mentioned in the documentation