大约有 45,000 项符合查询结果(耗时:0.0641秒) [XML]

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How to select rows from a DataFrame based o<em>nem> colum<em>nem> values?

How to select rows from a DataFrame based o<em>nem> values i<em>nem> some colum<em>nem> i<em>nem> P<em>a<em>nem>dem>as? 10 A<em>nem>swers ...
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How to access r<em>a<em>nem>dem>om item i<em>nem> list?

I have a<em>nem> ArrayList, <em>a<em>nem>dem> I <em>nem>eed to be able to click a butto<em>nem> <em>a<em>nem>dem> the<em>nem> r<em>a<em>nem>dem>omly pick out a stri<em>nem>g from that list <em>a<em>nem>dem> display it i<em>nem> a messagebox. ...
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What's the foolproof way to tell which versio<em>nem>(s) of .<em>Nem>ET are i<em>nem>stalled o<em>nem> a productio<em>nem> Wi<em>nem>dows Serv

...u should ope<em>nem> up IE o<em>nem> the server for which you are looki<em>nem>g for this i<em>nem>fo, <em>a<em>nem>dem> go to this site: http://www.ha<em>nem>selma<em>nem>.com/smallestdot<em>nem>et/ That's all it takes. The site has a script that looks your browser's "UserAge<em>nem>t" <em>a<em>nem>dem> figures out what versio<em>nem> (if a<em>nem>y) of the .<em>Nem>ET Framework you have (or do<em>nem>'t h...
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Speed up the loop operatio<em>nem> i<em>nem> R

... over a data.frame object. It simply adds a <em>nem>ew colum<em>nem> to a data.frame <em>a<em>nem>dem> accumulates somethi<em>nem>g. (simple operatio<em>nem>). The data.frame has roughly 850K rows. My PC is still worki<em>nem>g (about 10h <em>nem>ow) <em>a<em>nem>dem> I have <em>nem>o idea about the ru<em>nem>time. ...
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Why is sizeof co<em>nem>sidered a<em>nem> operator?

Why is sizeof co<em>nem>sidered a<em>nem> operator <em>a<em>nem>dem> <em>nem>ot a fu<em>nem>ctio<em>nem>? 10 A<em>nem>swers 10 ...
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SQL - fi<em>nem>d records from o<em>nem>e table which do<em>nem>'t exist i<em>nem> a<em>nem>other

...s, with varyi<em>nem>g efficie<em>nem>cy, depe<em>nem>di<em>nem>g o<em>nem> how good your query optimiser is, <em>a<em>nem>dem> the relative size of your two tables: This is the shortest stateme<em>nem>t, <em>a<em>nem>dem> may be quickest if your pho<em>nem>e book is very short: SELECT * FROM Call WHERE pho<em>nem>e_<em>nem>umber <em>Nem>OT I<em>Nem> (SELECT pho<em>nem>e_<em>nem>umber FROM Pho<em>nem>e_book) alte...
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Is it p<em>osem>sible to refresh a si<em>nem>gle UITableViewCell i<em>nem> a UITableView?

...UITableViewRowA<em>nem>imatio<em>nem><em>Nem>o<em>nem>e]; [self.tableView e<em>nem>dUpdates]; I<em>nem> Xcode 4.6 <em>a<em>nem>dem> higher: [self.tableView begi<em>nem>Updates]; [self.tableView reloadRowsAtI<em>nem>dexPaths:@[i<em>nem>dexPathOfYourCell] withRowA<em>nem>imatio<em>nem>:UITableViewRowA<em>nem>imatio<em>nem><em>Nem>o<em>nem>e]; [self.tableView e<em>nem>dUpdates]; You ca<em>nem> set whatever your like as a<em>nem>imat...
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Fi<em>nem>di<em>nem>g a substri<em>nem>g withi<em>nem> a list i<em>nem> Pytho<em>nem> [duplicate]

... All the a<em>nem>swers work but they always traverse the whole list. If I u<em>nem>derst<em>a<em>nem>dem> your questio<em>nem>, you o<em>nem>ly <em>nem>eed the first match. So you do<em>nem>'t have to co<em>nem>sider the rest of the list if you fou<em>nem>d your first match: mylist = ['abc123', 'def456', 'ghi789'] sub = 'abc' <em>nem>ext((s for s i<em>nem> mylist if sub i<em>nem> s), <em>Nem>o...
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How to break out of <em>nem>ested loops?

If I use a break stateme<em>nem>t, it will o<em>nem>ly break i<em>nem><em>nem>er loop <em>a<em>nem>dem> I <em>nem>eed to use some flag to break the outer loop. But if there are ma<em>nem>y <em>nem>ested loops, the code will <em>nem>ot look good. ...
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How to get the childre<em>nem> of the $(this) selector?

... @Ia<em>nem>Boyd, .childre<em>nem>() is where the "dow<em>nem> exactly o<em>nem>e level" comes from <em>a<em>nem>dem> :first is where the "first" came from. – Tyler Crompto<em>nem> Jul 3 '12 at 21:43 3 ...