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examples/numpy/int8.py

import numpy as np

a = np.array([127], 'int8')
print(a.dtype)   # int8
print(a)         # [127]

a[0] += 1        # [-128]
print(a)

a[0] -= 1        # [127]
print(a)

a[0] = 255
print(a)         # [-1]

a[0] += 1
print(a)         # [0]