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Draw a perfect circle from user's touch

...e, lines, etc, whatever came to his mind). Then he started to draw circles and then he asked me to make it "good circle" (from my understanding: make the drawn circle perfectly round, as we know no matter how stable we try to draw something with our finger on the screen, a circle is never really as...
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How to do a less than or equal to filter in Django queryset?

...tom field in each users profile called profile. This field is called level and is an integer between 0-3. 1 Answer ...
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Rails: confused about syntax for passing locals to partials

Understanding Rails "magic" with regards to rendering partials (and passing locals into them). 4 Answers ...
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PHP memory profiling

...page's memory usage? For example, to see how much memory my data is using, and/or which function calls are allocating the most memory. ...
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What is the syntax rule for having trailing commas in tuple definitions?

...hen you won't add another line to the end expecting to add another element and instead just creating a valid expression: a = [ "a", "b" "c" ] Assuming that started as a 2 element list that was later extended it has gone wrong in a perhaps not immediately obvious way. Always include the t...
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Difference between string and text in rails?

I'm making a new web app using Rails, and was wondering, what's the difference between string and text ? And when should each be used? ...
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How do I view 'git diff' output with my preferred diff tool/ viewer?

...file new-hex new-mode As most diff tools will require a different order (and only some) of the arguments, you will most likely have to specify a wrapper script instead, which in turn calls the real diff tool. The second method, which I prefer, is to configure the external diff tool via "git confi...
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How many concurrent requests does a single Flask process receive?

I'm building an app with Flask, but I don't know much about WSGI and it's HTTP base, Werkzeug. When I start serving a Flask application with gunicorn and 4 worker processes, does this mean that I can handle 4 concurrent requests? ...
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Objective-C: Where to remove observer for NSNotification?

I have an objective C class. In it, I created a init method and set up a NSNotification in it 14 Answers ...
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Does Django scale? [closed]

...e a list of Django sites on the front page of the main Django project page and then a list of Django built sites at djangosites.org. Going through the lists and picking some that I know have decent traffic we see: Instagram: What Powers Instagram: Hundreds of Instances, Dozens of Technologies. Pi...