Can't flatten a numpy array

Programming
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Issue: Flattening a 2D array with np.flatten() does not produce the expected output of a 1D array when using Python 3.7.4.

Code:

import numpy as np
array1 = np.array([[1, 2, 3, 2, 5, 8], [9, 5, 1, 7, 5, 3]])
array1.flatten()
print(array1)

Current Output:

[[1 2 3 2 5 8]
 [9 5 1 7 5 3]]

Expected Output:

[1 2 3 2 5 8 9 5 1 7 5 3]
2

Updated Code:

import numpy as np
array1 = np.array([[1, 2, 3, 2, 5, 8], [9, 5, 1, 7, 5, 3]])
flatten_array = array1.flatten()
print(flatten_array)

Answer:
The np.flatten() method does not modify the original array, but returns a copy of the flattened array. Therefore, the expected output is obtained by assigning the flattened array to a new variable flatten_array and then printing it.