Creation | np.triu()

import numpy as np
matrix = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
result = np.triu(m=matrix, k=0)
print(result)
'''
Output:
[[1 2 3]
 [0 5 6]
 [0 0 9]]
'''

import numpy as np
matrix = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
result = np.triu(m=matrix, k=1)
print(result)
'''
Output:
[[0 2 3]
 [0 0 6]
 [0 0 0]]
'''

import numpy as np
matrix = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
result = np.triu(m=matrix, k=-1)
print(result)
'''
Output:
[[1 2 3]
 [4 5 6]
 [0 8 9]]
'''