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How to get first element in a list of tuples?
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do you mean something like this?
new_list = [ seq[0] for seq in yourlist ]
What you actually have is a list of tuple objects, not a list of sets (as your original question implied). If it is actually a list of sets, then there is no first element because ...
Oracle: how to UPSERT (update or insert into a table?)
...d concurrently. The check for existence of a match and the insertion of a new record are not protected by a lock, so there is a race condition. To do this reliably, you need to catch this exception and either re-run the merge or do a simple update instead. In Oracle 10, you can use the "log error...
What is the difference between min SDK version/target SDK version vs. compile SDK version?
...t is 21. My App crashes when I run it on devices with lower API level. I'm new to Android, how should I proceed now?
– prgmrDev
Jul 23 '15 at 11:15
2
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How to validate an email address in JavaScript
...s dummy email addresses like asdf@adsf.adsf. You will need to update it as new top-level domains are added.
[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+(?:[A-Z]{2}|com|org|net|gov|mil|biz|info|mobi|name|aero|jobs|museum)\b
So even whe...
sql primary key and index
Say I have an ID row (int) in a database set as the primary key. If I query off the ID often do I also need to index it? Or does it being a primary key mean it's already indexed?
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MySQL Database won't start in XAMPP Manager-osx
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I have trying same thing but not working for new xampp 7.2.2: Following error message received (I have question blocked so I can't ask as new question on stackoverflow) Starting MySQL .2018-03-06 11:21:32 3610 mysqld_safe Logging to '/Applications/XAMPP/xamppfiles/var...
How to push both value and key into PHP array
...ut ['class'][] = $class;
$this->Input ['id'][] = $id;
}
}
$form = new Form();
$form->addTextField('myclass1','myid1');
$form->addTextField('myclass2','myid2');
$form->addTextField('myclass3','myid3');
When you dump it. The result like this
array (size=3)
'type' =>
arra...
Optional query string parameters in ASP.NET Web API
...pi/{controller}/{action}/{id}/{pid}/{sort}/{limit}", _
defaults:=New With {.id = RouteParameter.Optional, .pid = RouteParameter.Optional, .sort = UrlParameter.Optional, .limit = UrlParameter.Optional} _
)
sh...
How to see the changes between two commits without commits in-between?
...off the later of the two commits in question, then apply this diff to that new branch, you will see the changes between the two commits without headache of the intermittent commits.
– Craig Labenz
Oct 29 '15 at 22:00
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Positioning MKMapView to show multiple annotations at once
...IBAction)zoomOut:(id)sender {
CLLocationCoordinate2D southWest = _newLocation.coordinate;
CLLocationCoordinate2D northEast = southWest;
southWest.latitude = MIN(southWest.latitude, _annotation.coordinate.latitude);
southWest.longitude = MIN(southWest.longitude, _ann...