Thursday
Oct022014
Head, meet wall - Do not use a mutable as a default parameter in python

Remember that default parameters in python are evaluated at the time of definition.
I knew this, I really did. Can it be Friday yet?
In the following for the BadIdea
class a single list is created and every instance of BadIdea
is referencing that same list. Far better to make the default None
, test for that, and set to an empty list as necessary.
