python tips
时间：2011-01-11 来源：phoebus0501
is测试对象相等性
X=[1,2,3];
Y=X[:];
print('X',X);
print('Y',Y);
print(X==Y);
print(X is Y);
X[2]=2;
print('X',X);
print('Y',Y);
结果
X [1, 2, 3]
Y [1, 2, 3]
True
False
X [1, 2, 2]
Y [1, 2, 3]
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