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Scoping in Python 'for' loops

...asking about Python's scoping rules; I understand generally how scoping works in Python for loops. My question is why the design decisions were made in this way. For example (no pun intended): ...
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Determine if ActiveRecord Object is New

How can I check if an ActiveRecord object is new or is already persisted? 2 Answers ...
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How to set the prototype of a JavaScript object that has already been instantiated?

...below is no longer accurate. __proto__ is being added to ECMAScript 6 as "normative optional" which means it isn't required to be implemented but if it is, it must follow the given set of rules. This is currently unresolved but at least it will be officially part of JavaScript's specification. This...
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Add a new item to a dictionary in Python [duplicate]

I want to add an item to an existing dictionary in Python. For example, this is my dictionary: 3 Answers ...
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How do I hide an element when printing a web page?

...dia print { .no-print, .no-print * { display: none !important; } } Then add class='no-print' (or add the no-print class to an existing class statement) in your HTML that you don't want to appear in the printed version, such as your button. ...
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unit testing of private functions with mocha and node.js

I am using mocha in order to unit test an application written for node.js 9 Answers 9 ...
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ruby convert array into function arguments

...guments. Is there a way to on the fly convert the array into 2 arguments? For example: 2 Answers ...
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How to check internet access on Android? InetAddress never times out

I got a AsyncTask that is supposed to check the network access to a host name. But the doInBackground() is never timed out. Anyone have a clue? ...
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@RequestParam in Spring MVC handling optional parameters

Is it possible for a Spring controller to handle both kind of requests? 3 Answers 3 ...
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Saving a Numpy array as an image

...type of a Numpy array. How would I write it to disk it as an image? Any format works (png, jpeg, bmp...). One important constraint is that PIL is not present. ...