大约有 3,285 项符合查询结果（耗时：0.0377秒） [XML]
Django: Get an object form the DB, or 'None' if nothing matches
... use, but be careful with such quantifiers. Exceptions can be as slow (or "fast enough" for that matter), as anything in Python. Going back to the question - it is a shortcoming of the framework, that they didn't provide any queryset method to do this before 1.6! But as for this construct - it is ju...
How to change time and timezone in iPhone simulator?
...u need to capture screenshots or work with multiple apps, but it is a very fast way to switch among multiple timezones to test a single app.
– Hal Mueller
May 8 at 1:23
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How to install packages using pip according to the requirements.txt file from a local directory?
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Often, you will want a fast install from local archives, without probing PyPI.
First, download the archives that fulfill your requirements:
$ pip install --download <DIR> -r requirements.txt
Then, install using –find-links and –no-ind...
Quickest way to compare two generic lists for differences
...ist();
I suspect there are approaches which would actually be marginally faster than this, but even this will be vastly faster than your O(N * M) approach.
If you want to combine these, you could create a method with the above and then a return statement:
return !firstNotSecond.Any() && ...
How can I multiply and divide using only bit shifting and adding?
...ern processors, if pipelined properly, can do multiplication just about as fast as addition, by messing with the utilization of the ALUs (arithmetic units) in the processor.
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Comparing two dataframes and getting the differences
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There is a simpler solution that is faster and better,
and if the numbers are different can even give you quantities differences:
df1_i = df1.set_index(['Date','Fruit','Color'])
df2_i = df2.set_index(['Date','Fruit','Color'])
df_diff = df1_i.join(df2_i,how='o...
Favorite Django Tips & Features?
... alleviates you from always type os.path.join() which gets annoying pretty fast: j = lambda filename: os.path.join(PROJECT_DIR, filename). Then you just need to type j("static").
– wr.
May 11 '09 at 7:33
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How to detect the end of loading of UITableView
.... willDisplayCell: used here for smoother UI (single cell usually displays fast after willDisplay: call). You could also try it with tableView:didEndDisplayingCell:.
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Django filter versus get for single object?
...overhead without a benchmark (I think that in this case try/except will be faster as long as at least half of the calls return something)
– imposeren
May 4 '19 at 1:02
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Similar to jQuery .closest() but traversing descendants?
...tching criteria and then return the first one. While the Sizzle engine is fast, this represents unnecessary extra searching. There's no way to short-circuit the search and stop after the first match is found.
– icfantv
Oct 2 '14 at 20:33
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