在Python中比较元组
我有以下代码：
while current is not problem.getStartState():
print "Current: ", current, "Start: ", problem.getStartState()
现在由于某种原因比较效果不佳，您可以在以下输出中看到：
Current: (3, 5, 0, 0, 0, 0) Start: (4, 5, 0, 0, 0, 0)
Current: (4, 5, 0, 0, 0, 0) Start: (4, 5, 0, 0, 0, 0)
您可以看到即使 current 与 getStartState() 相同，它也会进入 while。此外，当它曾经是一个 2 字段元组 (x,y) 时，它工作得很好。
我做错了什么？谢谢
I have the following piece of code:
while current is not problem.getStartState():
print "Current: ", current, "Start: ", problem.getStartState()
now for some reason the comparison is not working well, you can see in the following output:
Current: (3, 5, 0, 0, 0, 0) Start: (4, 5, 0, 0, 0, 0)
Current: (4, 5, 0, 0, 0, 0) Start: (4, 5, 0, 0, 0, 0)
you can see that even though current is the same as getStartState() it enters the while. furthermore - when it used to be a 2 fields tuple (x,y) it worked fine.
What am I doing wrong ? Thanks
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评论（3）
是测试身份，而不是平等。你想要current != Problem.getStartState()有一个成语
is (not) None可以使用，因为None保证是单例。除非您真的这么想，否则不要将其用于其他类型！istests for identity, not equality. You wantcurrent != problem.getStartState()There is an idiom
is (not) Nonewhich works becauseNoneis guaranteed to be a singleton. Don't use it for other types unless you really mean it!is是身份（相同对象）比较器。在您的情况下，您需要一个相等（或不等式）（具有相同值的对象）运算符。isis the identity (same objects) comparator. In your case, you need an equality (or inequality) (objects with same values) operator.is 不是在这种情况下使用的正确检查。
要比较 2 个元组，只需使用 != 或 ==
例如，问题可以解决如下：
干杯，
is is not the correct check to be used in this case.
To compare 2 tuples just use != or ==
for instance the problem can be solved as follows:
cheers,