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How do I find the duplicates in a list and create another list with them?

... @Hugo, to see the list of duplicates, we just need to create a new list called dup and add an else statement. For example: dup = [] else: dup.append(x) – Chris Nielsen Apr 29 '16 at 16:45 ...
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RE error: illegal byte sequence on Mac OS X

...t a valid UTF-8 char. Note that, by contrast, GNU sed (Linux, but also installable on macOS) simply passes the invalid byte through, without reporting an error. Using the formerly accepted answer is an option if you don't mind losing support for your true locale (if you're on a US system and you ne...
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Ruby replace string with captured regex pattern

...d answer first without reading the entirety of answers. That seems to generally be the most efficient means of fixing a problem. Give Vicky a break! :) – Josh M. Jan 31 '14 at 3:43 ...
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Best general SVN Ignore Pattern?

...gardless of whether it is listed in the global ignore pattern or not. Generally you do not want *.dll being tracked by SVN however you can always explicitly add any necessary ones (which I often do in the case of third-party assemblies). – Zach Burlingame Apr 8...
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Search for executable files using find command

... @sourcejedi Thanks. I was actually only talking about non-GNU versions of find (BSD, in particular) but older versions of GNU find actually did support that syntax too. In newer versions you'll have to use / instead of +. See the updated answer for more d...
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Rails layouts per action?

...th this is that you cannot access objects such as current_user to conditionally determine the layout – Andrew K Dec 14 '14 at 5:25 ...
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How to efficiently count the number of keys/properties of an object in JavaScript?

...t only iterates through the object but also creates a whole new array with all its keys, so it completely fails at answering the question. – GetFree Jun 22 '12 at 14:28 43 ...
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What do the terms “CPU bound” and “I/O bound” mean?

...U (doing calculations). A program that computes new digits of π will typically be CPU-bound, it's just crunching numbers. A program is I/O bound if it would go faster if the I/O subsystem was faster. Which exact I/O system is meant can vary; I typically associate it with disk, but of course networ...
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Symfony 2 EntityManager injection in service

...to inject doctrine EntityManager, but I don't see that __construct() is called on my service, and injection doesn't work. ...
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PHP_SELF vs PATH_INFO vs SCRIPT_NAME vs REQUEST_URI

I am building a PHP application in CodeIgniter. CodeIgniter sends all requests to the main controller: index.php . However, I don't like to see index.php in the URI. For example, http://www.example.com/faq/whatever will route to http://www.example.com/index.php/faq/whatever . I need a reliable...