I'm just starting to use modules with classes for code commonality.

I don't have a good feel for the most efficient way to, for example, pass 
the db to a class method.  I can think of three ways.
- Pass it in when you call the method.
- Pass it in when you initialize the class
- Import current, do something like current.db = db and then pass current 
to the class's __init__

Any opinions on this?  All help greatly appreciated.

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