大约有 45,000 项符合查询结果（耗时：0.0547秒） [XML]
Use of def, val, and var in scala
...cala> def something = 2 + 3 * 4
something: Int
scala> something // now it's evaluated, lazily upon usage
res30: Int = 14
Example, val
scala> val somethingelse = 2 + 3 * 5 // it's evaluated, eagerly upon definition
somethingelse: Int = 17
Example, var
scala> var aVariable = 2 * 3...
Is there a standard way to list names of Python modules in a package?
...name):
file, pathname, description = imp.find_module(package_name)
if file:
raise ImportError('Not a package: %r', package_name)
# Use a set because some may be both source and compiled.
return set([os.path.splitext(module)[0]
for module in os.listdir(pathname)
...
Checking images for similarity with OpenCV
...) that indicates how similar these images are? E.g. 100% would be returned if the same image was passed twice, 0% would be returned if the images were totally different.
...
Length of a JavaScript object
...
This doesn't have to modify any existing prototype since Object.keys() is now built in.
Edit: Objects can have symbolic properties which can not be returned via Object.key method. So the answer would be incomplete without mentioning them.
Symbol type was added to the language to create unique ide...
Add CSS or JavaScript files to layout head from views or partial views
...-development-only.js")" type="text/javascript"></script>
@if (IsSectionDefined("AddToHead"))
{
@RenderSection("AddToHead", required: false)
}
@RenderSection("AddToHeadAnotherWay", required: false)
</head>
View:
@model ProjectsExt.Mod...
Representing graphs (data structure) in Python
...ill be the underlying structure for our Graph class. You also have to know if these connections are arcs (directed, connect one way) or edges (undirected, connect both ways). We'll handle that by adding a directed parameter to the Graph.__init__ method. We'll also add some other helpful methods.
im...
How can I get all the request headers in Django?
...A is a "standard Python dictionary containing all available HTTP headers". If you want to get all the headers you can simply iterate through the dictionary.
Which part of your code to do this depends on your exact requirement. Anyplace that has access to request should do.
Update
I need to ac...
In which situations do we need to write the __autoreleasing ownership qualifier under ARC?
...
Why is the __autoreleasing qualifier placed inbetween the stars, and not just in front of NSError**? This looks weird to me as the type is NSError**. Or is it because this is trying to indicate that the pointed-to NSError* pointer has to be qualified as po...
Is there any way to kill a Thread?
...other threads that must be killed as well.
The nice way of handling this if you can afford it (if you are managing your own threads) is to have an exit_request flag that each threads checks on regular interval to see if it is time for it to exit.
For example:
import threading
class StoppableThr...
static files with express.js
...
If there is only ONE parameter - then express.static expects that one parameter to be path....
– Seti
Dec 16 '16 at 8:21
...