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Is if(items != null) superfluous before foreach(T item in items)?
I often come across code like the following:
12 Answers
12
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Should I instantiate instance variables on declaration or in the constructor?
Is there any advantage for either approach?
15 Answers
15
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Automatically import modules when entering the python or ipython interpreter
...as np almost every single time I fire up the python interpreter. How do I set up the python or ipython interpreter so that numpy is automatically imported?
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Run an exe from C# code
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/// <summary>
/// Launch the application with some options set.
/// </summary>
static void LaunchCommandLineApp()
{
// For the example
const string ex1 = "C:\\";
const string ex2 = "C:\\Dir";
// Use ProcessStartInfo class
Pro...
The developers of this app have not set up this app properly for Facebook Login?
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the problem was you have to set
Do you want to make this app and all its live features available to the general public?
set status and review to ON and problem solved
enjoy coding
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What's a good rate limiting algorithm?
...ng timestamps)
Reading the question again, if the rate limit is fully reset each 8 seconds, then here is a modification:
Start with a timestamp, last_send, at a time long ago (e.g., at the epoch). Also, start with the same 5-token bucket.
Strike the every 5/8 seconds rule.
Each time you send a...
Capture keyboardinterrupt in Python without try-except
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An alternative to setting your own signal handler is to use a context-manager to catch the exception and ignore it:
>>> class CleanExit(object):
... def __enter__(self):
... return self
... def __exit__(self, exc_...
When should I use the Visitor Design Pattern? [closed]
I keep seeing references to the visitor pattern in blogs but I've got to admit, I just don't get it. I read the wikipedia article for the pattern and I understand its mechanics but I'm still confused as to when I'd use it.
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Qt: How do I handle the event of the user pressing the 'X' (close) button?
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You may want to also use setAttribute(Qt::WA_QuitOnClose); for MainWindow.
– Borzh
Nov 22 '15 at 17:14
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推荐系统算法初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...要买啥。在经济学中，有一个著名理论叫长尾理论（The Long Tail）。
套用在互联网领域中，指的就是最热的那一小部分资源将得到绝大部分的关注，而剩下的很大一部分资源却鲜少有人问津。这不仅造成了资源利用上的浪费，...