大约有 1,400 项符合查询结果（耗时：0.0290秒） [XML]
Explaining Python's '__enter__' and '__exit__'
..._future__ import with_statement at the top of the file if you're on Python 2.5).
with DatabaseConnection() as mydbconn:
# do stuff
PEP343 -- The 'with' statement' has a nice writeup as well.
share
|
...
Performance surprise with “as” and nullable types
...
The unrestricted nullable test is still 2.5 orders of magnitude slower, but there's some optimisation going on when you don't use the count variable. Adding Console.Write(count.ToString()+" "); after the watch.Stop(); in both cases slows the other tests by just und...
Difference between len() and .__len__()?
...n of remembering which case is which. (Sometimes an error slips in: until 2.5, you had to call foo.next() -- in 2.6, while that still works for backwards compatibility, you should call next(foo), and in 3.*, the magic method is correctly named __next__ instead of the "oops-ey" next!-).
So the gene...
Finding three elements in an array whose sum is closest to a given number
...fy the problem statement, instead we will search for aj and ak that sum to ai +S.
– Boolean
May 20 '11 at 14:59
3
...
Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
... every polynomial factors uniquely (ring of polynomials is an Euclidean domain), this means ai are uniquely determined, up to permutation.
This ends a proof that remembering powers is enough to recover the numbers. For constant k, this is a good approach.
However, when k is varying, the direct app...
Difference between author and committer in Git?
...
@adelphus on Git 2.5, it does work if you set both GIT_{COMMITTER,AUTHOR}_EMAIL
– Ciro Santilli 郝海东冠状病六四事件法轮功
Aug 15 '15 at 19:51
...
Difference between / and /* in servlet mapping url pattern
... answer with the mapping rules and an example.
Mapping rules from Servlet 2.5 specification:
Map exact URL
Map wildcard paths
Map extensions
Map to the default servlet
In our example, there're three servlets. / is the default servlet installed by us. Tomcat installs two servlets to serve jsp ...
Find which commit is currently checked out in Git
...how.
git log -1.
Bash prompt.
git status.
git bisect visualize.
I'll explain each option in detail below.
Option 1: git show
As explained in this answer to the general question of how to determine which commit you currently have checked-out (not just during git bisect), you can use git show wit...
How can I store my users' passwords safely?
...has been implemented in some quite well known projects:
phpBB3
WordPress 2.5+ as well as bbPress
the Drupal 7 release, (module available for Drupal 5 & 6)
others
The good thing is that you do not need to worry about the details, those details have been programmed by people with experience an...
Composer: how can I install another dependency without updating old ones?
... an explicit version constraint by running:
composer require new/package ~2.5
–OR–
Using the update command, add the new package manually to composer.json, then run:
composer update new/package
If Composer complains, stating "Your requirements could not be resolved to an installable se...