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Determine if variable is defined in Python [duplicate]
...eleted. I'm looking for something like defined() in Perl or isset() in PHP or defined? in Ruby.
6 Answers
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Check if an array is empty or exists
...iable hoisting. Make sure you use var whenever declaring a variable:
<?php echo "var image_array = ".json_encode($images);?>
// add var ^^^ here
And then make sure you never accidently redeclare that variable later:
else {
...
image_array = []; // no var here
}
...
Idiomatic way to convert an InputStream to a String in Scala
...en glue them all back together, though. If you can assume the stream's nonblocking, you could just use .available, read the whole thing into a byte array, and create a string from that directly.
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Should I use 'border: none' or 'border: 0'?
...der. The second two however are different with the first div in the second block being plain and the second div in the second block having a medium width dashed border.
So though they are both valid you may need to keep an eye on your styles if they do much cascading and such like I think.
<htm...
When would I use XML instead of SQL? [closed]
...used, which is storing all of my data in a (My)SQL database and then using PHP/Python/etc. to work with it on the web as needed.
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What exactly is an Assembly in C# or .NET?
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http://www.codeguru.com/columns/csharp_learning/article.php/c5845
An assembly is a file that is automatically generated by the compiler upon successful compilation of every .NET application. It can be either a Dynamic Link Library or an executable file. It is generated only once ...
Powershell equivalent of bash ampersand (&) for forking/running background processes
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Seems that the script block passed to Start-Job is not executed with the same current directory as the Start-Job command, so make sure to specify fully qualified path if needed.
For example:
Start-Job { C:\absolute\path\to\command.exe --afilepa...
What's the fastest way to delete a large folder in Windows?
...o take me for ever to use.. Oh well. Each file is only like 20 bytes. Darn PHP Session Files.
– Chrispix
Aug 28 '10 at 19:59
1
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Extracting bits with a single multiplication
...en the others. Whatever happened to N-1?? In this case, a...e becomes "one block" - they are multiplied by 1 to end up in the right place, and so "we got e for free". The same is true for b and d (b needs three spaces to the right, d needs the same three to its left). So when we compute the magic nu...
When does Java's Thread.sleep throw InterruptedException?
...w
InterruptedException, but you also do not want to do nothing. When a
blocking method detects interruption and throws InterruptedException,
it clears the interrupted status. If you catch InterruptedException
but cannot rethrow it, you should preserve evidence that the
interruption occurre...