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Difference between dict.clear() and assigning {} in Python
...ing methods are always useful if the original object is not in scope:
def fun(d):
d.clear()
d["b"] = 2
d={"a": 2}
fun(d)
d # {'b': 2}
Re-assigning the dictionary would create a new object and wouldn't modify the original one.
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Count the number of occurrences of a character in a string in Javascript
...share our ideas - just for fun, and perhaps some interesting benchmarks :)
https://gist.github.com/2757250
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Creating Multifield Indexes in Mongoose / MongoDB
...
By the way, the accepted answer is wrong, as per https://stackoverflow.com/a/52553550/129300 you should wrap the field names in single quotes, ie:
mySchema.index({'field1': 1, 'field2': 1}, {unique: true});
Happy Day!
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Format decimal for percentage values?
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brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Is 161803398 A 'Special' Number? Inside of Math.Random()
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Enable binary mode while restoring a Database from an SQL dump
...handled by mysqldump itself but not redirection of powershell.
reference: https://dba.stackexchange.com/questions/44721/error-while-restoring-a-database-from-an-sql-dump
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How can you tell when a layout has been drawn?
...n pixels of the parent layout object. But during the onCreate and onResume functions, the Layout has not been drawn yet, and so layout.getMeasuredHeight() returns 0.
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Unix command to find lines common in two files
...)-release
Copyright (C) 2007 Free Software Foundation, Inc.
$ cat > abc
123
567
132
$ cat > def
132
777
321
So the files abc and def have one line in common, the one with "132".
Using comm on unsorted files:
$ comm abc def
123
132
567
132
777
321
$ comm -12 abc def # No output! ...
How to select the row with the maximum value in each group
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The most intuitive method is to use group_by and top_n function in dplyr
group %>% group_by(Subject) %>% top_n(1, pt)
The result you get is
Source: local data frame [3 x 3]
Groups: Subject [3]
Subject pt Event
(dbl) (dbl) (dbl)
1 ...
Run an OLS regression with Pandas Data Frame
...efer to external packages like statsmodels, see some examples here: http://www.statsmodels.org/stable/regression.html
– javadba
Jan 25 '17 at 0:47
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