大约有 46,000 项符合查询结果（耗时：0.0774秒） [XML]
Django filter queryset __in for *every* item in list
....create(name='holiday')
In [3]: t2 = Tag.objects.create(name='summer')
In [4]: p = Photo.objects.create()
In [5]: p.tags.add(t1)
In [6]: p.tags.add(t2)
In [7]: p.tags.all()
Out[7]: [<Tag: holiday>, <Tag: summer>]
Using chained filters approach:
In [8]: Photo.objects.filter(tags=t1).fi...
git selective revert local changes from a file
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Paolo CapriottiPaolo Capriotti
3,9041616 silver badges2222 bronze badges
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Git Commit Messages: 50/72 Formatting
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284
Regarding the “summary” line (the 50 in your formula), the Linux kernel documentation has t...
Laravel 4 Eloquent Query Using WHERE with OR AND OR?
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481
Make use of Parameter Grouping (Laravel 4.2). For your example, it'd be something like this:
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How do you match only valid roman numerals with a regular expression?
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You can use the following regex for this:
^M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$
Breaking it down, M{0,4} specifies the thousands section and basically restrains it to between 0 and 4000. It's a relatively simple:
0: <empty> matched by M{0}
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How does this JavaScript/jQuery syntax work: (function( window, undefined ) { })(window)?
Have you ever taken a look under the hood at the jQuery 1.4 source code and noticed how it's encapsulated in the following way:
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MySQL - why not index every field?
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edited Mar 27 '11 at 0:04
answered Mar 26 '11 at 23:33
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Logic to test that 3 of 4 are True
I want to return True if and only if 3 out of 4 boolean values are true.
27 Answers
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Why is it slower to iterate over a small string than a small list?
...thon3 -m timeit '[x for x in ["a", "b", "c"]]'
1000000 loops, best of 3: 0.436 usec per loop
This disagrees with what you've found...
You must be using Python 2, then.
>>> python2 -m timeit '[x for x in "abc"]'
1000000 loops, best of 3: 0.309 usec per loop
>>> python2 -m timei...
Why would anybody use C over C++? [closed]
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edited Sep 4 '17 at 14:18
community wiki
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