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Replace values in list using Python [duplicate]
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Build a new list with a list comprehension:
new_items = [x if x % 2 else None for x in items]
You can modify the original list in-place if you want, but it doesn't actually save time:
items = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
fo...
JavaScript Editor Plugin for Eclipse [duplicate]
...ins for JavaScript files:
Open Eclipse -> Go to "Help" -> "Install New Software"
Select the repository for your version of Eclipse. I have Juno so I selected http://download.eclipse.org/releases/juno
Expand "Programming Languages" -> Check the box next to "JavaScript Development Tools"
Cl...
Make sure that the controller has a parameterless public constructor error
...ing a factory delegate:
container.Register<DashboardDbContext>(
new InjectionFactory(c => new DashboardDbContext()));
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Is there a replacement for unistd.h for Windows (Visual C)?
...//gist.github.com/ashelly/7776712 */
#include <process.h> /* for getpid() and the exec..() family */
#include <direct.h> /* for _getcwd() and _chdir() */
#define srandom srand
#define random rand
/* Values for the second argument to access.
These may be OR'd together. */
#define R_...
How to fix the Hibernate “object references an unsaved transient instance - save the transient insta
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Or you have created your entity object with new MyEntity (without synchronizing it to the database - flushing), instead of getting its synchronized instance from database. Making Hibernate queries using that instance informs you that what you expect to be in the databa...
Can anonymous class implement interface?
...ntation for you. Using the excellent LinFu project you can replace
select new
{
A = value.A,
B = value.C + "_" + value.D
};
with
select new DynamicObject(new
{
A = value.A,
B = value.C + "_" + value.D
}).CreateDuck<DummyInterface>();
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What is the difference between range and xrange functions in Python 2.X?
... python -m timeit 'for i in xrange(1000000):' ' pass'
10 loops, best of 3: 51.1 msec per loop
Personally, I always use .range(), unless I were dealing with really huge lists -- as you can see, time-wise, for a list of a million entries, the extra overhead is only 0.04 seconds. And as Corey points...
Programmatically find the number of cores on a machine
...etermine how many worker threads would be effective? Does one need to consider both the number of cores and hyper-threading? unsigned thread::hardware_concurrency() { SYSTEM_INFO info={0}; GetSystemInfo(&info); return info.dwNumberOfProcessors; }
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Selecting the first “n” items with jQuery
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Thank you, a side requirement of my request was about performances, so this the right answer for me. Thanks to the others for pointing out the :lt selector too.
– Omiod
Dec 8 '09 at 10:33
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How to wait for all threads to finish, using ExecutorService?
...n() and then awaitTermination():
ExecutorService taskExecutor = Executors.newFixedThreadPool(4);
while(...) {
taskExecutor.execute(new MyTask());
}
taskExecutor.shutdown();
try {
taskExecutor.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);
} catch (InterruptedException e) {
...
}
...