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How to find Unused Amazon EC2 Security groups
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This is the sample code written in boto (Python SDK for AWS) to list the Security Group against number of instances it is associated with.
You may use this logic to obtain the same in command line as well
Boto Code
import boto
ec2 = boto.connect_ec2()
sgs = ec2.g...
How do multiple clients connect simultaneously to one port, say 80, on a server? [duplicate]
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As expected, the output is blank. Now let's start a web server:
sudo python3 -m http.server 500
Now, here is the output of running netstat again:
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:500 0.0.0.0:* ...
How many socket connections can a web server handle?
...ven C# ranks at 11 (6.9M per second). Scala and Clojure rank further down. Python ranks at 29th at 2.7M per second.
At the bottom of the list, I note laravel and cakephp, rails, aspnet-mono-ngx, symfony, zend. All below 10k per second. Note, most of these frameworks are build for dynamic pages and q...
Why should the “PIMPL” idiom be used? [duplicate]
...) {
return new FooImpl;
}
Does this pattern have a name?
As an also Python and Java programmer, I like this a lot more than the pImpl idiom.
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What is the purpose of Flask's context stacks?
... multiple apps. Imagine the situation where you want to have a single WSGI Python interpreter run multiple Flask application. We're not talking Blueprints here, we're talking entirely different Flask applications.
You might set this up similar to the Flask documentation section on "Application Disp...
How can I access and process nested objects, arrays or JSON?
...t... what about JSON?
JSON is a textual representation of data, just like XML, YAML, CSV, and others. To work with such data, it first has to be converted to JavaScript data types, i.e. arrays and objects (and how to work with those was just explained). How to parse JSON is explained in the questio...
Workflow for statistical analysis and report writing
... I press "Go", Sweave dumps out a few score .tex files, and I run a little Python script to pdflatex them all. My predecessor spent ~6 weeks each year on these reports; I spend about 3 days (mostly on cleaning data; escape characters are hazardous).
It's very possible that there are better approac...
Mixin vs inheritance
...tiate abstract class Abstraction with
abstract methods complex_method
In Python, some classes in the abc module are examples of parent classes that both provide functionality through inheritance and abstract interfaces that must be implemented by the subclass. These ideas are not mutually exclusiv...
Redefine tab as 4 spaces
... help here too) Also, 8-char-wide tabs is "the standard" -- your terminal, Python, and many other tools default to 8-char-wide-tabs.
– Laurence Gonsalves
Jan 16 '19 at 21:04
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Remove duplicate values from JS array [duplicate]
...et(a));
}
or
let uniq = a => [...new Set(a)];
Note that, unlike in python, ES6 sets are iterated in insertion order, so this code preserves the order of the original array.
However, if you need an array with unique elements, why not use sets right from the beginning?
Generators
A "lazy", ...