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warning about too many open figures

In a script where I create many figures with fix, ax = plt.subplots(...) , I get the warning RuntimeWarning: More than 20 figures have been opened. Figures created through the pyplot interface (matplotlib.pyplot.figure) are retained until explicitly closed and may consume too much memory. ...
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Why should I declare a virtual destructor for an abstract class in C++?

I know it is a good practice to declare virtual destructors for base classes in C++, but is it always important to declare virtual destructors even for abstract classes that function as interfaces? Please provide some reasons and examples why. ...
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How do I add custom field to Python log format string?

My current format string is: 7 Answers 7 ...
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In log4j, does checking isDebugEnabled before logging improve performance?

I am using Log4J in my application for logging. Previously I was using debug call like: 16 Answers ...
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More than 10 lines in a node.js stack error?

Is there a way to get more than 10 lines in a node.js stack error? 4 Answers 4 ...
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Using the rJava package on Win7 64 bit with R

I'm trying to install rJava on a computer with Win 7 64 bit. When I run 12 Answers 1...
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Best practices for overriding isEqual: and hash

How do you properly override isEqual: in Objective-C? The "catch" seems to be that if two objects are equal (as determined by the isEqual: method), they must have the same hash value. ...
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Visual Studio Editor does not underline errors anymore

My Visual Studio (2008) Editor has stopped to underline Errors (this nifty wavy red lines). I can't really tell when, but it can be related to the installation of .Net Framework 3.5 SP 1 or the MVC Beta (which I guess is unlikely). Furthermore have I installed and uninstalled both CodeRush and Resha...
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What should every JavaScript programmer know? [closed]

Is there a set of things that every JavaScript programmer should know to be able to say "I know JavaScript"? 30 Answers ...
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Unable to update the EntitySet - because it has a DefiningQuery and no element exis

I am using Entity Framework 1 with .net 3.5. 21 Answers 21 ...