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Why shouldn't I use PyPy over CPython if PyPy is 6.3 times faster?
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PyPy, as others have been quick to mention, has tenuous support for C extensions. It has support, but typically at slower-than-Python speeds and it's iffy at best. Hence a lot of modules simply require CPython. PyPy doesn't support numpy PyPy now supports numpy. Some extensions are still not sup...
How to determine one year from now in Javascript
...e actual year minus 1900 (and so is fairly useless).
Thus a date marking exactly one year from the present moment would be:
var oneYearFromNow = new Date();
oneYearFromNow.setFullYear(oneYearFromNow.getFullYear() + 1);
Note that the date will be adjusted if you do that on February 29.
Similarly...
How do the major C# DI/IoC frameworks compare? [closed]
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Partial answer can be found here: manning-sandbox.com/thread.jspa?threadID=38943
– Mark Seemann
Jan 5 '11 at 10:16
25
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Why shouldn't Java enum literals be able to have generic type parameters?
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This is now being discussed as of JEP-301 Enhanced Enums. The example given in the JEP is, which is precisely what I was looking for:
enum Argument<X> { // declares generic enum
STRING<String>(String.class),
INTEGER<Integer>(Integer.class), ... ;
Class<X&...
Support for “border-radius” in IE
Does anyone know if/when Internet Explorer will support the "border-radius" CSS attribute?
11 Answers
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Create a dictionary on a list with grouping
...ecialVariableWhichIsAListOfDemoClass
.GroupBy(x => x.GroupKey)
.ToDictionary(gdc => gdc.Key, gdc => gdc.ToList());
You'd make it shorter if you used shorter variable names too, of course :)
However, might I suggest that a Lookup m...
Python __str__ versus __unicode__
...d method -- it returns characters. The names are a bit confusing, but in 2.x we're stuck with them for compatibility reasons. Generally, you should put all your string formatting in __unicode__(), and create a stub __str__() method:
def __str__(self):
return unicode(self).encode('utf-8')
In 3...
YYYY-MM-DD format date in shell script
...le to use printf's built-in date formatter (part of bash) rather than the external date (usually GNU date).
As such:
# put current date as yyyy-mm-dd in $date
# -1 -> explicit current date, bash >=4.3 defaults to current time if not provided
# -2 -> start time for shell
printf -v date '%(...
LINQ Ring: Any() vs Contains() for Huge Collections
...() on a List is O(n), while Contains() on a HashSet is O(1).
Any() is an extension method, and will simply go through the collection, applying the delegate on every object. It therefore has a complexity of O(n).
Any() is more flexible however since you can pass a delegate. Contains() can only acce...