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Fix for Python 3 RuntimeError #12

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Fix for Python 3 RuntimeError #12

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This small change fixes an issue on Python 3 related to modifying a dictionary in-flight causing a RuntimeError: dictionary changed size during iteration exception.

@dagwieers
Fix for Python 3 RuntimeError
666389a 
This small change fixes an issue on Python 3 related to modifying a dictionary in-flight causing a **RuntimeError: dictionary changed size during iteration** exception.
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By using list() on a dictionary we are explicitly looping over a copy of the dictionary keys, this avoids modifying the dictionary we are iterating on.

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