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Extending the User model with custom fields in Django

What's the best way to extend the User model (bundled with Django's authentication app) with custom fields? I would also possibly like to use the email as the username (for authentication purposes). ...
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What is lexical scope?

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.gitignore exclude folder but include specific subfolder

I have the folder application/ which I add to the .gitignore . Inside the application/ folder is the folder application/language/gr . How can I include this folder? ...
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Cross compile Go on OSX?

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How can I do test setup using the testing package in Go

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Finding local IP addresses using Python's stdlib

...ind local IP addresses (i.e. 192.168.x.x or 10.0.x.x) in Python platform independently and using only the standard library? ...
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Why is MATLAB so fast in matrix multiplication?

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How to get all properties values of a JavaScript Object (without knowing the keys)?

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If i synchronized two methods on the same class, can they run simultaneously?

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How efficient is locking an unlocked mutex? What is the cost of a mutex?

...xes (like what pthread gives me or whatever the native system library provides) or a single one for an object. 5 Answers ...