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Deleting DataFrame row in Pandas based on column value
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Good update for query. It allows for more rich selection criteria (eg. set-like operations like df.query('variable in var_list') where 'var_list' is a list of desired values)
– philE
Sep 30 '14 at 20:32
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Export to CSV via PHP
...ay &$array)
{
if (count($array) == 0) {
return null;
}
ob_start();
$df = fopen("php://output", 'w');
fputcsv($df, array_keys(reset($array)));
foreach ($array as $row) {
fputcsv($df, $row);
}
fclose($df);
return ob_get_clean();
}
Then you can make your user...
How do I ignore files in Subversion?
...n as "unversioned": your SVN client will pretend the file doesn't exist at all in the filesystem.
Ignored files are specified by a "file pattern". The syntax and format of file patterns is explained in SVN's online documentation: http://svnbook.red-bean.com/nightly/en/svn.advanced.props.special.ign...
Why does Oracle 9i treat an empty string as NULL?
...r exists but is not known by the user, data where there is no answer, etc. all of which constitute some sense of NULL).
By the time that the SQL standard came around and agreed that NULL and the empty string were distinct entities, there were already Oracle users that had code that assumed the two ...
Error installing libv8: ERROR: Failed to build gem native extension
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try this one:
gem install libv8 -v '3.16.14.3' -- --with-system-v8
Note : Because libv8 is the interface for the V8 engine used by therubyracer,
you may need to use libv8, even if you have V8 installed already. If
you wish to use your ow...
jquery disable form submit on enter
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Usually form is submitted on Enter when you have focus on input elements.
We can disable Enter key (code 13) on input elements within a form:
$('form input').on('keypress', function(e) {
return e.which !== 13;
});
DEMO: ...
Java: convert List to a String
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StringJoiner is especially useful if one wants to join to something like [a, b, c] including the braces.
– koppor
Feb 17 '16 at 6:26
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The smallest difference between 2 Angles
...les in the range -PI -> PI around a coordinate, what is the value of the smallest of the 2 angles between them?
9 Answers
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Best way to store time (hh:mm) in a database
...e, but what's the best way to do this without storing more info than I actually need?
15 Answers
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SQL - Update multiple records in one query
...e updated so it's just u need to add the parent id and child ids to update all the rows u need using a small script.
UPDATE [Table]
SET couloumn1= (select couloumn1 FROM Table WHERE IDCouloumn = [PArent ID]),
couloumn2= (select couloumn2 FROM Table WHERE IDCouloumn = [PArent ID]),
co...