大约有 19,605 项符合查询结果（耗时：0.0295秒） [XML]
How to automatically install Emacs packages by specifying a list of package names?
...
Based on comments by Profpatsch and answers below:
(defun ensure-package-installed (&rest packages)
"Assure every package is installed, ask for installation if it’s not.
Return a list of installed packages or nil fo...
Automatic Retina images for web sites
...sted by Paul Boag.
Adaptive Images, a (mostly) server side solution. It is based on a cookie storing the screen resolution, a web server configured to serve images from a PHP script, and named script to read the cookie and serve the appropriate image.
A bunch of possibilities well described and disc...
Using python's eval() vs. ast.literal_eval()?
...ow
s = """
(lambda fc=(
lambda n: [
c for c in
().__class__.__bases__[0].__subclasses__()
if c.__name__ == n
][0]
):
fc("function")(
fc("code")(
0,0,0,0,"KABOOM",(),(),(),"","",0,""
),{}
)()
)()
"""
eval(s, {'__builtins__':{}})
In the above code ().__class...
How does having a dynamic variable affect performance?
...chmark numbers
*Update 3: Added IL-Emitted and Lazy IL-Emitted benchmarks, based on Mark Gravell's answer to this question.
To my knowledge, use of the dynamic keyword does not cause any extra compilation at runtime in and of itself (though I imagine it could do so under specific circumstances, depe...
How do I get a value of datetime.today() in Python that is “timezone aware”?
...rather suggest to use the pytz library, which has a constantly updated database of most timezones.
Working with local timezones can be very tricky (see "Further reading" links below), so you may rather want to use UTC throughout your application, especially for arithmetic operations like calculatin...
What is N-Tier architecture?
...that uses
middleware to service data requests
between a user and a database employs
multi-tier architecture. The most
widespread use of "multi-tier
architecture" refers to three-tier
architecture.
It's debatable what counts as "tiers," but in my opinion it needs to at least cross the p...
How do I set a column value to NULL in SQL Server Management Studio?
...
I think @Zack properly answered the question but just to cover all the bases:
Update myTable set MyColumn = NULL
This would set the entire column to null as the Question Title asks.
To set a specific row on a specific column to null use:
Update myTable set MyColumn = NULL where Field = Co...
Why use a prime number in hashCode?
...
So 31 is chosen based on the assumption that hash table implementors know that 31 is commonly used in hash codes?
– Steve Kuo
Aug 31 '10 at 21:50
...
Strip Leading and Trailing Spaces From Java String
...
PS: Migrating the answer here based on the comments from - stackoverflow.com/questions/3796121/…
– Naman
Jul 23 '18 at 17:12
5
...
SVN encrypted password store
...
You can get it without recompiling, based on ubuntuforums.org/showthread.php?t=1348567. Just set this to ~/.subversion/config [auth] password-stores = gnome-keyring
– fikr4n
Apr 29 '12 at 3:21
...