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What would a “frozen dict” be?
... as expected, but you can't write to the mapping proxy object itself.
Admittedly it's not quite the same thing as an "immutable, hashable dict" - but it's a decent substitute given the same kind of use cases for which we might want a frozendict.
...
When and why would you seal a class?
...recently exchanged with a person at Microsoft, who told me they tried to limit the inheritance to the places where it really made full sense, because it becomes expensive performance-wise if left untreated. The sealed keyword tells the CLR that there is no class further down to look for methods, and...
通信连接组件 · App Inventor 2 中文网
... android.media.action.STILL_IMAGE_CAMERA
可选取多个文件（图片、音频、视频等）：
Action: android.intent.action.GET_CONTENT
更多有关Activity启动器使用技巧请查看《Activity启动器如何查看并启动其他App》。
属性
Action
...
Android accelerometer accuracy (Inertial navigation)
...you assume the device never changes it's attitude, which would be pretty limiting. No one reads the TOS anyway.
Oh, and you know that INS drifts with the rotation of the earth, right? So there's that too. One hour later and you're mysteriously climbing on a 15° slope into space. That's assuming yo...
App Launcher 应用启动器扩展：用于启动其他应用程序的强大工具，支持独立...
...ight: "#ffffff" //背景颜色}); App Inventor 2 中文网 MIT同步更新的中文本土化 积木式在线App开发平台！ © 2023 - document.write(new Date().getFullYear()); 跟着学（上海）教育科技有限公司 版权所有，未经书面许...
What is the __del__ method, How to call it?
...case that makes sense. If you need to use __del__, be aware of the basic limitations per http://docs.python.org/reference/datamodel.html:
__del__ is called when the garbage collector happens to be collecting the objects, not when you lose the last reference to an object and not when you execute de...
base64 encoded images in email signatures
...edited Nov 28 '19 at 22:25
Baum mit Augen♦
45.2k1313 gold badges128128 silver badges167167 bronze badges
answered Feb 2 '12 at 9:49
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What is “entropy and information gain”?
...ss information it contains, all the way to the all-green, bulb-burnt-out limit.
It turns out there's a way to measure the amount of information in a signal, based on the the probabilities of the different symbols. If the probability of receiving symbol xi is pi, then consider the quantity
-log pi...
How to create GUID / UUID?
...) to get the same UUID:
function generateUUID() { // Public Domain/MIT
var d = new Date().getTime();//Timestamp
var d2 = (performance && performance.now && (performance.now()*1000)) || 0;//Time in microseconds since page-load or 0 if unsupported
return 'xxxxxxx...
MQTT物联网协议完全实践指南 · App Inventor 2 中文网
...ight: "#ffffff" //背景颜色}); App Inventor 2 中文网 MIT同步更新的中文本土化 积木式在线App开发平台！ © 2023 - document.write(new Date().getFullYear()); 跟着学（上海）教育科技有限公司 版权所有，未经书面许...