'numpy.ndarray' object has no attribute 'isnull'

'numpy.ndarray' object does not have the 'isnull' attribute. The 'isnull' function is a part of the pandas library and can be used to check for missing values in a pandas DataFrame or Series.

If you have a numpy array and want to check for missing values, you can use the 'numpy.isnan' function instead. It returns a boolean array indicating whether each element in the array is NaN (Not a Number) or not.

Here's an example of how you can use 'numpy.isnan' to check for missing values in a numpy array:

import numpy as np

arr = np.array([1, 2, np.nan, 4, 5])
is_missing = np.isnan(arr)

print(is_missing)

This will output:

[False False  True False False]

In this example, the element at index 2 is NaN, so the corresponding value in the 'is_missing' array is 'True'.