大约有 41,000 项符合查询结果（耗时：0.0608秒） [XML]
Get month name from number
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answered Jul 2 '11 at 14:21
siamesiame
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How to hide iOS status bar
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edited Apr 23 '14 at 4:22
answered Sep 24 '13 at 11:49
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Remove rows with duplicate indices (Pandas DataFrame and TimeSeries)
...subset='index', keep='first').set_index('index')
1000 loops, best of 3: 1.54 ms per loop
>>> %timeit df3.groupby(df3.index).first()
1000 loops, best of 3: 580 µs per loop
>>> %timeit df3[~df3.index.duplicated(keep='first')]
1000 loops, best of 3: 307 µs per loop
Note that you ...
Best way to unselect a in jQuery?
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Esailija
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answered Dec 7 '09 at 4:26
Ei MaungEi Maung
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Change key pair for ec2 instance
...6yegor256
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Why in C++ do we use DWORD rather than unsigned int? [duplicate]
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4 Answers
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Active
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How to pinch out in iOS simulator when map view is only a portion of the screen?
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edited Apr 18 '14 at 14:34
Praveen
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Check if a JavaScript string is a URL
...+[a-z]{2,}|'+ // domain name
'((\\d{1,3}\\.){3}\\d{1,3}))'+ // OR ip (v4) address
'(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*'+ // port and path
'(\\?[;&a-z\\d%_.~+=-]*)?'+ // query string
'(\\#[-a-z\\d_]*)?$','i'); // fragment locator
return !!pattern.test(str);
}
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How do I create a URL shortener?
...ou just do a reverse lookup in your alphabet.
e9a62 will be resolved to "4th, 61st, and 0th letter in the alphabet".
e9a62 = [4,61,0] = 4×622 + 61×621 + 0×620 = 1915810
Now find your database-record with WHERE id = 19158 and do the redirect.
Example implementations (provided by commenters)
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Creating an R dataframe row-by-row
...de in R.
If you can, allocate your entire data.frame up front:
N <- 1e4 # total number of rows to preallocate--possibly an overestimate
DF <- data.frame(num=rep(NA, N), txt=rep("", N), # as many cols as you need
stringsAsFactors=FALSE) # you don't know levels yet...