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- how to allow only one item selected?
...have a <SELECT multiple> field with multiple options and I want to allow it to have only one option selected at the same time but user can hold CTRL key and select more items at once.
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Flatten list of lists [duplicate]
...p evaluates MUCH faster than the unraveled loop and eliminates the append calls!
If you have multiple items in a sublist the list comp will even flatten that. ie
>>> list_of_lists = [[180.0, 1, 2, 3], [173.8], [164.2], [156.5], [147.2], [138.2]]
>>> flattened = [val for sublist...
How to get a random value from dictionary in python
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@Duncan: I can't wait till all the 3rd party libraries are Python 3.x compatible, so the Python questions don't need 2 answers for every question.
– Gerrat
Feb 1 '11 at 13:54
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Is mongodb running?
I have installed mongodb and the php drivers on my unix server.
9 Answers
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How do you check if a certain index exists in a table?
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Actually.. be careful! This will fail if the index doesn't already exist! At least in SQL Server 2008.
– Andrey Kaipov
Apr 10 '17 at 19:12
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What is the difference between a schema and a table and a database?
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A little cryptic, but not wrong; but do you really think a selfproclaimed n00b would understand that?
– Stein G. Strindhaug
Nov 18 '08 at 13:49
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Is there a sleep function in JavaScript? [duplicate]
... There could be confusion, but it is rare that someone wants to actually block all computation in the entire program. For beginners, the question is usually "how do I pause this one individual function for a bit?" in my experience, so the answer is to await on a promise with setTimeout(): mas...
How to align a to the middle (horizontally/width) of the page [duplicate]
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why do you use width:800px ? will this work for all screens?
– themhz
Oct 14 '15 at 14:25
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What is the “-->” operator in C++?
...old value and 0 ..." to make it clearer. But this is nitpicking anyway. We all know what is meant.
– Johannes Schaub - litb
Jan 30 '10 at 17:42
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Responsive image align center bootstrap 3
...When displayed on tablets, the product images look ugly because of their small size (500x500) and a width of 767 pixels in the browser. I want to put the image in the center of the screen, but for some reason I can not. Who be will help solve the problem?
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