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Removing duplicates in lists
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97
>>> t = [1, 2, 3, 1, 2, 5, 6, 7, 8]
>>> t
[1, 2, 3, 1, 2, 5, 6, 7, 8]
>>...
App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 · App Inventor 2 中文网
...能通过人工拼包用最简单的蓝牙广播方式通信，可以做到手机与设备进行简单的交互。
无连接的
是单向的，可以向任何人或者接收器发送数据。
使用广播方式通信没有任何安全措施，任何监听设备都能收到，因此它可能...
How can I replace every occurrence of a String in a file with PowerShell?
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Shaun Luttin
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answered Jul 20 '16 at 20:04
John V Hob...
Django Passing Custom Form Parameters to Formset
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Carl MeyerCarl Meyer
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How do I insert a linebreak where the cursor is without entering into insert mode in Vim?
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Aristotle PagaltzisAristotle Pagaltzis
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add a...
void in C# generics?
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97
You cannot use void, but you can use object: it is a little inconvenience because your would-be...
How often should you use git-gc?
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Aristotle PagaltzisAristotle Pagaltzis
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How to change to an older version of Node.js
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Shaun LuttinShaun Luttin
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Is there still any reason to learn AWK?
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97
I think it depends on the environment you find yourself in. If you are a *nix person, then know...
How do you query for “is not null” in Mongo?
...: "http://example.com/foo.png" }
{ "_id" : ObjectId("544540c91b5cf91c4893eb97"), "imageUrl" : "http://example.com/bar.png" }
{ "_id" : ObjectId("544540ed1b5cf91c4893eb98"), "otherField" : 1 }
{ "_id" : ObjectId("544540f11b5cf91c4893eb99"), "otherField" : 2 }
Now, create the sparse index on imageUr...