numpy的基本用法——numpy array的copy

#!/usr/bin/env python
# _*_ coding: utf-8 _*_

import numpy as np

# Test 1
a = np.arange(4)
print a

# 直接赋值, a,b,c,d是同一个array
b = a
c = a
d = b
a[0] = 10
print b is a
print c is a
print d is a

# Test 1 result
[0 1 2 3]
True
True
True

# Test 2
# 深拷贝
b = a.copy()
b[0] = 12
print b is a
print a
print b

# Test 2 result
False
[10  1  2  3]
[12  1  2  3]