x1 = 5
y1 = 5
x2 = 'Hello'
y2 = 'Hello'
x3 = [1,2,3]
y3 = [1,2,3]
print(x1 is y1)
print(x2 is y2)
print(x3 is y3)
x1 = 5
y1 = 5
x2 = 'Hello'
y2 = 'Hello'
x3 = [1
阅读背景：
为什么python将新的id分配给list，tuples，dict，即使它们具有相同的值？
来源：互联网
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