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How does collections.defaultdict work?
...ded of course they do not exist yet). To create such a "default" item, it calls the function object that you pass to the constructor (more precisely, it's an arbitrary "callable" object, which includes function and type objects). For the first example, default items are created using int(), which ...
Copy constructor versus Clone()
...ICloneable should be a deep or shallow clone, thus the interface is semantically broken as your callers won't know whether the call will deep or shallow clone the object.
Instead, you should define your own IDeepCloneable (and IShallowCloneable) interfaces with DeepClone() (and ShallowClone()) meth...
convert a list of objects from one type to another using lambda expression
...sult will be returned in a new IEnumerable<TargetType>. The .ToList call is an extension method which will convert this IEnumerable<TargetType> into a List<TargetType>.
share
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What is a thread exit code?
...d not waiting for them to finish. The easiest way to deal with this is to call Wait() on a Task started and returned by another method as shown in this sample: asp.net/web-api/overview/advanced/… RunAsync().Wait();
– Bron Davies
Aug 25 '15 at 21:59
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How to make completely transparent navigation bar in iOS 7
...];
}
@end
Now, you can import the category in your UIViewController and call the methods on your navigation controller - for example:
#import "UINavigationController+TransparentNavigationController.h"
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.navigationC...
When to use dynamic vs. static libraries
...c libraries aren't necessarily loaded -- they're usually loaded when first called -- and can be shared among components that use the same library (multiple data loads, one code load).
Dynamic libraries were considered to be the better approach most of the time, but originally they had a major flaw ...
How to write a Python module/package?
...ny folder with an __init__.py is considered a module by python and you can call them a package
|-HelloModule
|_ __init__.py
|_ hellomodule.py
You can go about with the import statement on your module the usual way.
For more information, see 6.4. Packages.
...
socket.error: [Errno 48] Address already in use
...ave to resort to tougher methods like sending a SIGKILL (kill -s KILL <pid> or kill -9 <pid>) signal instead. See Wikipedia for more details.
Alternatively, run the server on a different port, by specifying the alternative port on the command line:
$ python -m SimpleHTTPServer 8910
Ser...
How to get the return value from a thread in python?
...motive make?
If you really want join() to return the return value of the called function, you can do this with a Thread subclass like the following:
from threading import Thread
def foo(bar):
print 'hello {0}'.format(bar)
return "foo"
class ThreadWithReturnValue(Thread):
def __init_...
How to log source file name and line number in Python
...
Sure, check formatters in logging docs. Specifically the lineno and pathname variables.
%(pathname)s Full pathname of the source file where the logging call was issued(if available).
%(filename)s Filename portion of pathname.
%(module)s Module (name portion of filen...