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Define a lambda expression that raises an Exception
...you create a callable and replace it's __code__ value with the code object from above, you get something that can be evaluated without using statements. Achieving all this, though, results in very obscure code:
map(lambda x, y, z: x.__setattr__(y, z) or x, [lambda: 0], ["__code__"], [compile("rais...
How do I get the opposite (negation) of a Boolean in Python?
...__invert__ like that could be confusing because it's behavior is different from "normal" Python behavior. If you ever do that clearly document it and make sure that it has a pretty good (and common) use-case.
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Print a string as hex bytes?
...somehow.
If your terminal doesn't accept these characters, you can decode from UTF-8 or use the names (so you can paste and run the code along with me):
a_string = (
"\N{CYRILLIC CAPITAL LETTER PE}"
"\N{CYRILLIC SMALL LETTER ER}"
"\N{CYRILLIC SMALL LETTER I}"
"\N{CYRILLIC SMALL LET...
How to create a JavaScript callback for knowing when an image is loaded?
...the load()-event in jQuery but it won't always fire if the image is loaded from the browser cache. This plugin https://github.com/peol/jquery.imgloaded/raw/master/ahpi.imgload.js can be used to remedy that problem.
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How to get the name of a class without the package?
...pe is anonymous is "[]".
It is actually stripping the package information from the name, but this is hidden from you.
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How does a Java HashMap handle different objects with the same hash code?
...f HashMap's mechanism, for Java 8 version, (it might be slightly different from Java 6).
Data structures
Hash table
Hash value is calculated via hash() on key, and it decide which bucket of the hashtable to use for a given key.
Linked list (singly)
When count of elements in a bucket is small, a...
What are the different usecases of PNG vs. GIF vs. JPEG vs. SVG?
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@sudo No, BMP sure is easy to decode from a processing perspective, but unless it's stored locally on an SSD, I'd assume getting the file to the CPU to process will be slower than just processing a JPG, especially on a properly-written JPG decoder that uses hard...
Do python projects need a MANIFEST.in, and what should be in it?
...l base for setuptools as setuptools shall take care of hiding these things from you.
EDIT: Last few projects I use pbr for building distribution packages with three line setup.py and rest being in setup.cfg and requirements.txt. No need to care about MANIFEST.in and other strange stuff. Even though...
log4j logging hierarchy order
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Use the force, read the source (excerpt from the Priority and Level class compiled, TRACE level was introduced in version 1.2.12):
public final static int OFF_INT = Integer.MAX_VALUE;
public final static int FATAL_INT = 50000;
public final static int ERROR_INT = 4...
Check OS version in Swift?
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I made helper functions that were transferred from the below link into swift:
How can we programmatically detect which iOS version is device running on?
func SYSTEM_VERSION_EQUAL_TO(version: String) -> Bool {
return UIDevice.currentDevice().systemVersion.compare...