1 ，浅拷贝 ： 同一对象 nd02 = nd01
代码 ：
if __name__ == '__main__':
nd01 = np.arange(12).reshape(2,6)
nd02 = nd01
print(nd01 is nd02)
=================================
True
2 ，半深拷贝 ： 不同对象，同一元素 nd02 = nd01.view()
代码 ： 元素会同步改变
if __name__ == '__main__':
nd01 = np.arange(12).reshape(2,6)
nd02 = nd01.view()
print(nd01 is nd02)
nd01[0,2] = 999
print(nd01)
print(nd02)
================================
False
[[ 0 1 999 3 4 5]
[ 6 7 8 9 10 11]]
[[ 0 1 999 3 4 5]
[ 6 7 8 9 10 11]]
3 ，深度拷贝 ：完全不同
代码 ：
if __name__ == '__main__':
nd01 = np.arange(12).reshape(2,6)
nd02 = nd01.copy()
print(nd01 is nd02)
nd01[0,2] = 999
print(nd01)
print(nd02)
====================================
False
[[ 0 1 999 3 4 5]
[ 6 7 8 9 10 11]]
[[ 0 1 2 3 4 5]
[ 6 7 8 9 10 11]]
Processed:
0.012, SQL:
9
