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What does bundle exec rake mean?
... command to execute a script in the context of the current bundle (the one from your directory's Gemfile). rake db:migrate is the script where db is the namespace and migrate is the task name defined.
So bundle exec rake db:migrate executes the rake script with the command db:migrate in the context...
Why is Scala's immutable Set not covariant in its type?
... the method works just like Set's. So there is nothing really stopping Set from being co-variant, except a design decision.
– Daniel C. Sobral
Jul 24 '09 at 2:44
6
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What is the rationale for fread/fwrite taking size and count as arguments?
...character encodings like UTF-8.
The SUS notes that this is actually taken from the ISO C documents.
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Check if a given key already exists in a dictionary
...for any key you can either use dict.setdefault() repeatedly or defaultdict from the collections module, like so:
from collections import defaultdict
d = defaultdict(int)
for i in range(100):
d[i % 10] += 1
but in general, the in keyword is the best way to do it.
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node.js equivalent of python's if __name__ == '__main__' [duplicate]
...do this which may be the preferred method:
When a file is run directly from Node, require.main is set to its module.
To take advantage of this, check if this module is the main module and, if so, call your main code:
var fnName = function() {
// main code
}
if (require.main === module) {...
Where is my Django installation?
... this:
>>> import django
>>> django
<module 'django' from '/usr/local/lib/python2.6/dist-packages/django/__init__.pyc'>
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SQL Server - inner join when updating [duplicate]
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UPDATE R
SET R.status = '0'
FROM dbo.ProductReviews AS R
INNER JOIN dbo.products AS P
ON R.pid = P.id
WHERE R.id = '17190'
AND P.shopkeeper = '89137';
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Filtering DataGridView without changing datasource
...DataTable, DataBinding and DataSet.
My problem is with filtering DataTable from DataSet object, which is displayed on DataGridView.
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How to run Gulp tasks sequentially one after the other
...ering why there is no official documentation for gulp.start(), this answer from gulp member explains that: gulp.start is undocumented on purpose because it can lead to complicated build files and we don't want people using it (source: github.com/gulpjs/gulp/issues/426#issuecomment-41208007)
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How to get the current time in YYYY-MM-DD HH:MI:Sec.Millisecond format in Java?
... be hiding data.
If you want to eliminate any microseconds or nanoseconds from your data, truncate.
Instant instant2 = instant.truncatedTo( ChronoUnit.MILLIS ) ;
The java.time classes use ISO 8601 format by default when parsing/generating strings. A Z at the end is short for Zulu, and means UTC....