大约有 44,000 项符合查询结果（耗时：0.0479秒） [XML]
Selecting multiple columns in a pandas dataframe
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Hugolmn
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answered Jul 2 '12 at 2:43
elyely
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Reorder levels of a factor without changing order of values
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edited Mar 20 '16 at 11:39
Henrik
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ans...
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 are everyday machines programmed?
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edited Apr 13 '11 at 1:34
community wiki
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Why is it common to put CSRF prevention tokens in cookies?
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answered Dec 11 '13 at 11:48
SilverlightFoxSilverlightFox
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Is It Possible to NSLog C Structs (Like CGRect or CGPoint)?
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edited Jun 13 '11 at 19:31
jscs
61.3k1212 gold badges141141 silver badges184184 bronze badges
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Hg: How to do a rebase like git's rebase
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Community♦
111 silver badge
answered Apr 20 '10 at 4:14
Ry4an BraseRy4an Brase
76.6k66 go...
What is the $? (dollar question mark) variable in shell scripting? [duplicate]
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Melvyn
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answered Jul 26 '11 at 18:15
PoomalairajPoomalairaj...
In which language are the Java compiler and JVM written?
...and.
– Jörg W Mittag
Jan 26 '10 at 11:05
18
Please provide a reference to the Sun JVM being writ...
How can I use PowerShell with the Visual Studio Command Prompt?
.... Simply change "Microsoft Visual Studio 10.0" to "Microsoft Visual Studio 11.0"
– Andy S
Jul 17 '12 at 23:41
9
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