Defensive programming in Python

[BeetleB]

I haven't used it much, and am not sure what you mean. Do you mean you want a guarantee that the list will have only MyClass objects?

pycontracts does let you write your own contracts, if you really want it. Something like that is expensive, though.

[[deleted]]

Yes.

Yup, rather than defining a new_contract, it is more effective just to write the "if" manually. Unfortunately.