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Class constants in python

In python, I want a class to have some "constants" (practically, variables) which will be common in all subclasses. Is there a way to do it with friendly syntax? Right now I use: ...
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UITextField - capture return button event

How can I detect when a user pressed "return" keyboard button while editing UITextField? I need to do this in order to dismiss keyboard when user pressed the "return" button. ...
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Convert Json Array to normal Java list

... way to convert JSON Array to normal Java Array for android ListView data binding? 14 Answers ...
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Is there a builtin confirmation dialog in Windows Forms?

I'd like to create a simple confirm dialog saying "Please check the information and if you're sure it's correct, click OK." ...
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How do I import the javax.servlet API in my Eclipse project?

I want to develop with Servlets in Eclipse, but it says that the package javax.servlet cannot be resolved. How can I add javax.servlet package to my Eclipse project? ...
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Xcode 4 - “Valid signing identity not found” error on provisioning profiles on a new Macintosh insta

I had a Macintosh I used to develop iPhone apps with using XCode 4. I now have a new Macintosh with a new install of... everything. ...
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How can I calculate an md5 checksum of a directory?

... find /path/to/dir/ -type f -name "*.py" -exec md5sum {} + | awk '{print $1}' | sort | md5sum The find command lists all the files that end in .py. The md5sum is computed for each .py file. awk is used to pick off the md5sums...
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Why can't I use an alias in a DELETE statement?

In SQL Server Compact Edition in Visual Studio 2010 (maybe SQL Server and SQL in general, I don't know), this command works: ...
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How to migrate back from initial migration in Django 1.7?

...els are poorly thought out. As I haven't committed the code the sensible thing would be to migrate the database to last good state and redo the migration with better models. In this case the last good state is database where the new app doesn't exist. ...
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Can you set a border opacity in CSS?

...rward CSS way to make the border of an element semi-transparent with something like this? 9 Answers ...