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Complex numbers usage in python [closed]
...suffix comes from electrical engineering, where the variable ‘i’ is usually used for current. (Reasoning found here.)
The type of a complex number is complex, and you can use the type as a constructor if you prefer:
>>> complex(2,3)
(2+3j)
A complex number has some built-in accesso...
How to get time in milliseconds since the unix epoch in Javascript? [duplicate]
How can I get the current epoch time in Javascript? Basically the number of milliseconds since midnight, 1970-01-01.
2 A...
Two forward slashes in a url/src/href attribute [duplicate]
... myResourceUrl = 'https://example.com/my-resource.js';
}
type of logic all over your codebase (assuming, of course, that the server at example.com is able to serve resources via both http and https).
A prominent real-world example is the Magento E-Commerce engine: for performance reasons, the sh...
Negative list index? [duplicate]
...
True although not all languages are able to follow this design. In C, n[-1] literally means the element prior to n[0] and is fine if n points into an array - even if it's more normally a bug. [dlang.org/d-array-article.html](Slicing in D) is a...
Access a variable outside the scope of a Handlebars.js each loop
...guide/expressions.html#path-expressions
Some helpers like #with and #each allow you to dive into nested objects. When you include ../ segments into your path, Handlebars will change back into the parent context.
{{#each people}}
{{../prefix}} {{firstname}}
{{/each}}
Even though the ...
Angular.js vs Knockout.js vs Backbone.js [closed]
...estion to answer. I find Backbone to be the easiest, but I work in Angular all day. Performance is more up to the coder than the framework, in my opinion.
Are you doing heavy DOM manipulation? I would use jQuery and Backbone.
Very data driven app? Angular with its nice data binding.
Game programm...
Get data from JSON file with PHP [duplicate]
I'm trying to get data from the following JSON file using PHP. I specifically want "temperatureMin" and "temperatureMax".
3...
闲扯Nginx的accept_mutex配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...际上Nginx作者Igor Sysoev曾经给过相关的解释：
OS may wake all processes waiting on accept() and select(), this is called thundering herd problem. This is a problem if you have a lot of workers as in Apache (hundreds and more), but this insensible if you have just several workers as ...
Converting a list to a set changes element order
...ct.fromkeys(x for x in a if x not in b)
{2: None, 210: None}
b doesn't really need to be ordered here – you could use a set as well. Note that a.keys() - b.keys() returns the set difference as a set, so it won't preserve the insertion order.
In older versions of Python, you can use collections....
What is the difference between window, screen, and document in Javascript?
...t model. You can access it as window
window.screen or just screen is a small information object about physical screen dimensions.
window.document or just document is the main object of the potentially visible (or better yet: rendered) document object model/DOM.
Since window is the global object ...