大约有 40,000 项符合查询结果（耗时：0.0416秒） [XML]
How do I get the first n characters of a string without checking the size or going out of bounds?
...g (10,7);
This would work in the case that you seem to be worried about (based on your comments to other answers), not breaking the flow of the code when doing lots of string building stuff.
share
|
...
Scrolling child div scrolls the window, how do I stop that?
...
Many browser scroll wheels disappear and reappear based on the user moving the mouse now, so the above comment is problem no longer an issue.
– Keith Holliday
Oct 16 '15 at 3:42
...
How to properly document S4 class slots using Roxygen2?
... pending @slot solution. I know that is not how the question is posed, but based on comments (including @hadley's) it seems @slot is the "real" answer. I agree with your assessment that an itemized list (as in my question) is the current best practice, though hopefully replaced very soon.
...
Running two projects at once in Visual Studio
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
Draft saved
Draft discarded
...
How do you create a remote Git branch?
...
Create a new branch locally based on the current branch:
git checkout -b newbranch
Commit any changes as you normally would. Then, push it upstream:
git push -u origin HEAD
This is a shortcut to push the current branch to a branch of the same nam...
How to choose between Hudson and Jenkins? [closed]
...
@magic: At least based on this brief comparison, a fortnight after the split, Jenkins is by far more active. In any case, while I'm with Jenkins, it's interesting to see what the Sonatype guys are up to.
– Jonik
...
Changing the interval of SetInterval while it's running
...I wanted a solution of a decelerating timer that could have its rate reset based on application events; this met that need simply and perfectly. Thank you.
– Andrew Brown
Mar 28 '17 at 18:22
...
How to get Top 5 records in SqLite?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
Draft saved
Draft discarded
...
How to make a flat list out of list of lists?
...,l)'
1000 loops, best of 3: 1.1 msec per loop
Explanation: the shortcuts based on + (including the implied use in sum) are, of necessity, O(L**2) when there are L sublists -- as the intermediate result list keeps getting longer, at each step a new intermediate result list object gets allocated, an...
Select DISTINCT individual columns in django?
...
One way to get the list of distinct column names from the database is to use distinct() in conjunction with values().
In your case you can do the following to get the names of distinct categories:
q = ProductOrder.objects.values('Category').distinct()
print q.query # See for yourself...