I don't like mutability. Whenever it's possible I use immutable objects and JVM is pretty damn good optimized to handle a lot of object allocations. But there are rare cases when you just can't copy ...
How-To Geek on MSN
7 Python mistakes that make your code slow (and the fixes that matter)
Python is a language that seems easy to do, especially for prototyping, but make sure not to make these common mistakes when coding.
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