大约有 48,000 项符合查询结果（耗时：0.0962秒） [XML]
Extract first item of each sublist
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You could use zip:
>>> lst=[[1,2,3],[11,12,13],[21,22,23]]
>>> zip(*lst)[0]
(1, 11, 21)
Or, Python 3 where zip does not produce a list:
>>> list(zip(*lst))[0]
(1, 11, 21)
Or,
>>> next(zip(*lst))
(1, 11, 21)
Or, (my favorite) u...
How to explain callbacks in plain english? How are they different from calling one function from ano
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115
+50
Often a...
LEFT JOIN only first row
...n to same problem :)
– galdikas
Feb 11 '16 at 10:36
2
subquery is too slow.
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How do you reverse a string in place in C or C++?
...essors.
– Patrick Schlüter
Aug 15 '11 at 17:42
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show 16 more comments
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What does the -u flag mean in git push -u origin master? [closed]
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152
The -u option does the following:
For every branch that is up to date or successfully pushed, ...
Is there a limit to the length of HTML attributes?
...limited" then?
– Anders Lindén
Aug 11 '15 at 14:41
2
Thank you! Although I can't upvote - this a...
Oracle SQL Query for listing all Schemas in a DB
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edited Dec 5 '16 at 11:39
Lam92
3555 bronze badges
answered Jan 28 '11 at 22:02
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How do I get the web page contents from a WebView?
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JLamkin
71155 silver badges1717 bronze badges
answered Feb 3 '11 at 21:36
jluckyivjluckyiv
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How to create has_and_belongs_to_many associations in Factory girl
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