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Are duplicate keys allowed in the definition of binary search trees?
...se problems. Imagine your tree rule is this:
left < root <= right
Now imagine a simple tree whose root is 5, left child is nil, and right child is 5. If you do a left rotation on the root you end up with a 5 in the left child and a 5 in the root with the right child being nil. Now somethi...
Is unsigned integer subtraction defined behavior?
...
Thank you! I now see the interpretation I was missing. I think they could have chosen a clearer wording though.
– user14554
Aug 28 '11 at 14:25
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Return first N key:value pairs from dict
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This answer is no longer correct. Python dicts now preserve insertion order, and this is explicitly documented.
– Konrad Rudolph
Sep 22 at 12:30
1
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Difference between “module.exports” and “exports” in the CommonJs Module System
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At this time module.exports and exports pointing to the same reference.
Now, imagine you re-write
greet.js as
exports = function () {
console.log('Hello World');
};
console.log(exports);
console.log(module.exports);
the output will be
[Function]
{}
the reason is : module.exports is a...
git: Switch branch and ignore any changes without committing
...bsentmindedly made minor changes to the code that are not worth keeping. I now want to change branches, but git gives me,
1...
How do I get my Maven Integration tests to run
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The Maven build lifecycle now includes the "integration-test" phase for running integration tests, which are run separately from the unit tests run during the "test" phase. It runs after "package", so if you run "mvn verify", "mvn install", or "mvn de...
Curious null-coalescing operator custom implicit conversion behaviour
...ils here. We have a nullable optimizer that looks for situations where we know that a particular expression of nullable type cannot possibly be null. Consider the following naive analysis: we might first say that
result = Foo() ?? y;
is the same as
A? temp = Foo();
result = temp.HasValue ?
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Switch branch names in git
...ed from before I started my crap work. Practically this works fine, I just now have a different branch as my main development branch. I'm wondering how I could change things around so I'm working on master again but it doesn't have my junk work and said work is on a different branch.
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What is getattr() exactly and how do I use it?
...here getattr can be useful.
you can't write object.x, because you don't know in advance which attribute you want (it comes from a string). Very useful for meta-programming.
you want to provide a default value. object.y will raise an AttributeError if there's no y. But getattr(object, 'y', 5) will...
SQL injection that gets around mysql_real_escape_string()
...5.6 by default: big5, cp932, gb2312, gbk and sjis. We'll select gbk here.
Now, it's very important to note the use of SET NAMES here. This sets the character set ON THE SERVER. If we used the call to the C API function mysql_set_charset(), we'd be fine (on MySQL releases since 2006). But more on wh...