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How do different retention policies affect my annotations?

Can anyone explain in a clear way the practical differences between the java.lang.annotation.RetentionPolicy constants SOURCE , CLASS , and RUNTIME ? ...
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How do you determine which backend is being used by matplotlib?

Either interactively, such as from within an Ipython session, or from within a script, how can you determine which backend is being used by matplotlib? ...
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Haskell export current module with additional imported module

Is it possible to write a module in Haskell, which re-exports a module in addition to exporting everything visible inside? ...
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What's the 'environment' task in Rake?

According to " Custom Rake Tasks ": 3 Answers 3 ...
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How to drop into REPL (Read, Eval, Print, Loop) from Python code

Is there a way to programmatically force a Python script to drop into a REPL at an arbitrary point in its execution, even if the script was launched from the command line? ...
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MySQL - How to select data by string length

Is there a MySQL function to do this (of course instead of string_length )? 6 Answers ...
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How to conditionally push an item in an observable array?

...rray , but only if the item is not already present. Is there any "find" function or recommended pattern for achieving this in KnockoutJS? ...
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How can I suppress column header output for a single SQL statement?

I'm executing some SQL statements in batch (using the mysql command-line binary). I want one of my several SELECT statements to not print the column headers, just the selected records. Is this possible? ...
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cancelling queued performSelector:afterDelay calls

does anybody know if it is possible to cancel already queued selector events from the event stack or timer stack (or whatever mechanism it is that is utilized by the API) when you call performSelector:withObject:afterDelay ? ...
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How to make vi redraw screen?

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