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How to take the first N items from a generator or list in Python? [duplicate]
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Slicing a generator
import itertools
top5 = itertools.islice(my_list, 5) # grab the first five elements
You can't slice a generator directly in Python. itertools.islice() will wrap an object in a new slicing generator using the syntax itertools.islice(generator, start, stop, step)
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What is the maximum value for an int32?
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My mnemonic: 2^10 is very near to 1000, so 2^(3*10) is 1000^3 or about 1 billion. One of the 32 bits is used for sign, so the max value is really only 2^31, which is about twice the amount you get for 2^(3*10): 2 billion.
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Unable to cast object of type 'System.DBNull' to type 'System.String`
I got the above error in my app. Here is the original code
11 Answers
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How do I kill all the processes in Mysql “show processlist”?
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You need to kill them one by one, MySQL does not have any massive kill command. You can script it in any language, for example in PHP you can use something like:
$result = mysql_query("SHOW FULL PROCESSLIST");
while ($row=mysql_fetch_array($result)) {
$pro...
How do I format a number with commas in T-SQL?
...d in SQL Server 2008 to look at data/index space ratios of some tables in my database. Of course I am getting all sorts of large numbers in the results and my eyes are starting to gloss over. It would be really convenient if I could format all those numbers with commas (987654321 becomes 987,654,...
Best way to build a Plugin system with Java
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I've embedded equinox into my application and used standard OSGi practices to do exactly what the OP wants. In swing too, not SWT. Webstarted as well. good starting resource: neilbartlett.name/blog
– basszero
Jan...
How do I modify the URL without reloading the page?
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Here is my solution (newUrl is your new URL which you want to replace with the current one):
history.pushState({}, null, newUrl);
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What is the difference between parseInt(string) and Number(string) in JavaScript? [duplicate]
...ly that some time ago. That cost me some time to find the bug... I updated my answer with a reference to another answer.
– sjngm
Aug 9 '13 at 13:42
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Trying to add adb to PATH variable OSX
I am trying to develop for android and I want to add the adb to my PATH so that I can launch it really easily. I have added directories before by for some reason adb does not want to be found. This is very frustrating. Has anyone else had this problem before?
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Check if an element is present in an array [duplicate]
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Using widely supported myArray.indexOf(myVal) > -1 is same thing but safer
– vinsa
Aug 12 '18 at 23:09
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