大约有 47,000 项符合查询结果（耗时：0.0624秒） [XML]
check if directory exists and delete in one command unix
...produce similar results but actually doing a test before the command makes more sense.
– Ankur Chauhan
Jan 28 '13 at 5:04
...
C/C++ with GCC: Statically add resource files to executable/library
...m needs some precalculated table for lookups. And I am sure there are alot more cases when storing data in the program makes a lot of sense.
– ndim
Feb 1 '11 at 16:39
15
...
Send response to all clients except sender
...
This is more useful than everything on the socket.io docs combined
– Jonathan.
Jun 9 '15 at 12:29
...
How to change a module variable from another module?
...ad of symbol. I would suggest that the Python language reference make this more clear and less sparse..
The from form does not bind the module name: it goes through the
list of identifiers, looks each one of them up in the module found in
step (1), and binds the name in the local namespace t...
What's an elegant way to conditionally add a class to an HTML element in a view?
...
I use the first way, but with a slightly more succinct syntax:
<div class="<%= 'ok' if @status == 'success' %>">
Though usually you should represent success with boolean true or a numeric record ID, and failure with boolean false or nil. This way you...
Get Unix Epoch Time in Swift
...ds but sometimes one scale (one digit to the right of the decimal) less or more. When it returns a scale of 5 (5 digits after the decimal), I don't know if Swift is dropping the trailing 0 or it couldn't produce 6 scales of precision. But when it returns a scale of 7, that extra digit can be truncat...
Two single-column indexes vs one two-column index in MySQL?
... queries using either or both of the columns fast, but of course uses also more disk space.
When choosing the indexes, you also need to consider the effect on inserting, deleting and updating. More indexes = slower updates.
...
How to detect unused methods and #import in Objective-C
...ntil you get a compile error/warning.
Unused Objective-C methods are much more difficult to detect than unused C functions because messages are dispatched dynamically. A warning or error can tell you that you have a potential problem, but the lack of one doesn't guarantee you won't have runtime err...
JS Client-Side Exif Orientation: Rotate and Mirror JPEG Images
...
|
show 6 more comments
105
...
Python argparse mutual exclusive group
... I would not call this a 'hack' for this case, since it seems both more readable and manageable - thanks for pointing it out!
– sage
Aug 9 '16 at 18:58
13
...