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When do you use Java's @Override annotation and why?
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Use it every time you override a method for two benefits. Do it so that you can take advantage of the compiler checking to make sure you actually are overriding a method when you think you are. This way, if you make a common mistake of mi...
How do you run your own code alongside Tkinter's event loop?
...his code written, and it works nicely, but the birds need to move every moment .
5 Answers
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Adding additional data to select options using jQuery
...ata('foo');
...
});
});
// Plain old JavaScript
var sel = document.getElementById('select');
var selected = sel.options[sel.selectedIndex];
var extra = selected.getAttribute('data-foo');
See this as a working sample using jQuery here: http://jsfiddle.net/GsdCj/1/
See this as a working...
Is it OK to leave a channel open?
... (never close the channel) if I never check for its state? Will it lead to memory leaks? Is the following code OK?
5 Answer...
String formatting in Python 3
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"({} goals, ${})".format(self.goals, self.penalties)
And since the parameters are fields of self, there's also a way of doing it using a single argument twice (as @Burhan Khalid noted in the comments):
"({0.goals} goals, ${0.penalties})".format(self)
Explaining:
{} means just the next posit...
Aren't promises just callbacks?
...way you do, you get little benefit. But if you write them the way they are meant to be used, you can write asynchronous code in a way that resembles synchronous code and is much more easy to follow:
api().then(function(result){
return api2();
}).then(function(result2){
return api3();
}).the...
How to validate IP address in Python? [duplicate]
...'s the best way to validate that an IP entered by the user is valid? It comes in as a string.
11 Answers
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What requirement was the tuple designed to solve?
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When writing programs it is extremely common to want to logically group together a set of values which do not have sufficient commonality to justify making a class.
Many programming languages allow you to logically group together a set of otherwise unrela...
Do regular expressions from the re module support word boundaries (\b)?
...t;>> y
<_sre.SRE_Match object at 0x100418850>
Also forgot to mention, you should be using raw strings in your code
>>> x = 'one two three'
>>> y = re.search(r"\btwo\b", x)
>>> y
<_sre.SRE_Match object at 0x100418a58>
>>>
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Class method decorator with self arguments?
How do I pass a class field to a decorator on a class method as an argument? What I want to do is something like:
5 Answer...