numpy copy & deep copy

shaoheshaohe

import numpy as np

# copy & deep copy

a = np.arange(4)
print(a)
b = a
c = a
d = b

# 改变a[0] 的值
print('******************')
a[0] = 11
print(a)
print(b)
print(b is a)
print('******************')
print(c)
print(c is a)
print('******************')
d[1: 3] = [22,33]
print(d)
print(a)
print(d is a)
print('******************')

# deep copy
b = a.copy()
print(b)
a[3] = 44
print(a)
print(b)
print('******************')

结果：
[0 1 2 3]

[11 1 2 3]
[11 1 2 3]
True

[11 1 2 3]
True

[11 22 33 3]
[11 22 33 3]
True

[11 22 33 3]
[11 22 33 44]
[11 22 33 3]


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