numpy mean ignore nan

# Python code to demonstrate the  
# use of numpy.nanmean  
import numpy as np  
    
# create 2d array with nan value.  
arr = np.array([[20, 15, 37], [47, 13, np.nan]])  
    
print("Shape of array is", arr.shape)  
    
print("Mean of array without using nanmean function:",  
                                           np.mean(arr))  
    
print("Using nanmean function:", np.nanmean(arr))