大约有 40,000 项符合查询结果（耗时：0.0320秒） [XML]
querySelector, wildcard element match?
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TylerH
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answered Jun 19 '14 at 3:18
StephaneAGStephaneAG
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C++ convert vector to vector
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answered Jun 18 '11 at 21:51
James McNellisJames McNellis
319k7070 gold badges865865 silver badges944944 bronze badges
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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) use numpy:
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How to check if a variable is set in Bash?
..."unset var", "echo $var" produces no output).
– Brent212
Sep 9 '14 at 22:04
10
For the solution's...
How do you commit code as a different user?
...e.
– Chris Johnsen
Sep 12 '10 at 23:21
Can you give a specific example, everything I try
– studg...
How to calculate time in hours between two dates in iOS
...3201. please correct me.
– Jeet
Aug 21 '12 at 9:19
Not working for me. Got diff value as 9223372036854775807. Is it in...
How to make div background color transparent in CSS
... value with color and 100% transparency*/
background-color: rgba(117, 190, 218, 1.0); /* 100% transparent */
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Matplotlib: “Unknown projection '3d'” error
...n__)'
– Charlie Parker
Sep 5 '17 at 21:06
2
what about version 2.0.2?
– Cha...
How can I check if character in a string is a letter? (Python)
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answered Mar 21 '13 at 21:24
rainerrainer
5,10122 gold badges1919 silver badges3636 bronze badges
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Preserve line endings
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21
Works for me even with sed -i: it is just important how to type it. While sed -bi and sed -i -b work, sed -ib does not work: see the man pa...