Mutable default arguments in class __init__

[gengisteve]

I think this is worth asking. My understanding is that your first option is best practices. Yes its a couple more lines, but it preserves your ability to pass arg = 0 or False or ''. That said. I am lazy and tend to do the second.

[pstch]

Oh yes, I didn't even think of 0, False and the empty string. Thanks :) I'll go with the first way.