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What is the purpose of setting a key in data.table?
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Minor update: Please refer to the new HTML vignettes as well. This issue highlights the other vignettes that we plan to.
I've updated this answer again (Feb 2016) in light of the new on= feature that allows ad-hoc joins as well. See history for earlier (outdat...
Throwing cats out of windows
...org/wiki/Terminal_velocity
http://www.grc.nasa.gov/WWW/K-12/airplane/termv.html
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Best way to generate random file names in Python
...generate temporary file names, see http://docs.python.org/library/tempfile.html. For instance:
In [4]: import tempfile
Each call to tempfile.NamedTemporaryFile() results in a different temp file, and its name can be accessed with the .name attribute, e.g.:
In [5]: tf = tempfile.NamedTemporaryFil...
nosetests is capturing the output of my print statements. How to circumvent this?
...one want to see the source: nose.readthedocs.org/en/latest/plugins/capture.html
– Ceasar Bautista
Jul 27 '12 at 18:30
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How I can I lazily read multiple JSON values from a file/stream in Python?
...alls it 'JSON lines':
https://docs.scrapy.org/en/latest/topics/exporters.html?highlight=exporters#jsonitemexporter
http://www.enricozini.org/2011/tips/python-stream-json/
You can do it slightly more Pythonically:
for jsonline in f:
yield json.loads(jsonline) # or do the processing in this...
EditText, inputType values (xml)
...planations: http://developer.android.com/reference/android/widget/TextView.html#attr_android:inputType
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CKEditor instance already exists
...'s meant for internal use: docs.cksource.com/ckeditor_api/symbols/CKEDITOR.html#.remove You should use instead instace.destroy() as madhaviaddanki said.
– AlfonsoML
Jun 29 '10 at 11:04
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What is the difference between tree depth and height?
... 1, and an empty graph having width 0. mathworld.wolfram.com/GraphDiameter.html
– Daniel A.A. Pelsmaeker
Nov 26 '18 at 10:48
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Calculate difference in keys contained in two Python dictionaries
...e a look at the Unit testing framework: docs.python.org/2/library/unittest.html, just follow the assertDictEqual method in the source code.
– Laurent LAPORTE
Nov 20 '13 at 6:52
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MySQL: Sort GROUP_CONCAT values
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Sure, see http://dev.mysql.com/doc/refman/...tions.html#function_group-concat:
SELECT student_name,
GROUP_CONCAT(DISTINCT test_score ORDER BY test_score DESC SEPARATOR ' ')
FROM student
GROUP BY student_name;
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