大约有 38,000 项符合查询结果（耗时：0.0432秒） [XML]
Add a new element to an array without specifying the index in Bash
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1599
Yes there is:
ARRAY=()
ARRAY+=('foo')
ARRAY+=('bar')
Bash Reference Manual:
In the conte...
Turning multi-line string into single comma-separated
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93
You can use awk and sed:
awk -vORS=, '{ print $2 }' file.txt | sed 's/,$/\n/'
Or if you want...
Are static fields open for garbage collection?
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answered Jan 17 '09 at 9:44
bruno condebruno conde
45.3k1313 gold badges9191 silver badges112112 bronze badges
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Preserving signatures of decorated functions
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79
Install decorator module:
$ pip install decorator
Adapt definition of args_as_ints():
import...
How to find difference between two Joda-Time DateTimes in minutes
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79
This will get you the difference between two DateTime objects in milliseconds:
DateTime d1 = ne...
Will using 'var' affect performance?
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edited Jun 20 at 9:12
Community♦
111 silver badge
answered Dec 10 '08 at 17:21
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How to use SQL Order By statement to sort results case insensitive?
... Dharman
16.7k1414 gold badges4343 silver badges9595 bronze badges
answered Mar 10 '10 at 1:09
dan04dan04
73.7k2020 gold badge...
Is there a javadoc tag for documenting generic type parameters?
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9
@skaffman A bit late of course, but it raises the question, it does not beg the question.
– Thor84no
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Replacing blank values (white space) with NaN in pandas
...since pandas 0.13:
df = pd.DataFrame([
[-0.532681, 'foo', 0],
[1.490752, 'bar', 1],
[-1.387326, 'foo', 2],
[0.814772, 'baz', ' '],
[-0.222552, ' ', 4],
[-1.176781, 'qux', ' '],
], columns='A B C'.split(), index=pd.date_range('2000-01-01','2000-01-06'))
# r...
Permission denied for relation
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9
run it as a superuser, like postgres.
– Chris Travers
Mar 20 '13 at 12:21
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