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How can you dynamically create variables via a while loop? [duplicate]
...dictionaries, but that's normally not noticeable in any way (except for performance), and it may change in the future. Examples of namespaces are: the set of built-in names (functions such as abs(), and built-in exception names); the global names in a module; and the local names in a function invoca...
In javascript, is an empty string always false as a boolean?
...w String("") is truthy! This is because it is an object, whereas the short form "" represents the primitive value version. The same goes for new Number(0) and even new Boolean(false). It's a good reason not to use the object versions in your code, and it does mean that if (str.length) handles this e...
Get current batchfile directory
... going to change environment variables or the current directory, it's good form.
– Jamie
May 25 '18 at 17:28
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show 1 more comment
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Django FileField with upload_to determined at runtime
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Does this work with ModelForm? I can see that instance has all the attributes of the class model, but there are no values (just a str of the field name). In the template, user is hidden. I may have to submit a question, I have been googling this f...
Why exactly is eval evil?
...oblems are. I see now from the answers here what they are (security and performance problems).
– Jay
Apr 3 '10 at 14:21
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Can JavaScript connect with MySQL?
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Javascript (in the client-side, browser form) is used every day to connect with server-side technologies (Apache, Nginx, PHP, NodeJS, etc) running on the server. The very definition of server/client requires that the "divide" between them be surmountable.
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HTML minification? [closed]
...anagement, image optimization, etc will make a bigger difference to the performance of your site overall. Those tools will show you what the biggest problems are -- if you've dealt with them all and still find that HTML minification makes a significant difference, go for it.
(If you're sure you wa...
How to turn on WCF tracing?
...;
<source name="System.ServiceModel"
switchValue="Information, ActivityTracing"
propagateActivity="true" >
<listeners>
<add name="xml"/>
</listeners>
</source>
<source name="System.ServiceMode...
What is the purpose of “!” and “?” at the end of method names?
...or readability, but they do have common meanings:
Methods ending in ! perform some permanent or potentially dangerous change; for example:
Enumerable#sort returns a sorted version of the object while Enumerable#sort! sorts it in place.
In Rails, ActiveRecord::Base#save returns false if saving fai...
“On-line” (iterator) algorithms for estimating statistical median, mode, skewness, kurtosis?
...lications.
I would love to see an incremental mode estimator of a similar form...
UPDATE
I just modified the incremental median estimator to estimate arbitrary quantiles. In general, a quantile function (http://en.wikipedia.org/wiki/Quantile_function) tells you the value that divides the data int...