Even though the PEP doesn't explicitly mention mutable default arguments, I'm pretty sure it's intended for this use case, as well. It should address this issue

Even though the PEP doesn't explicitly mention mutable default arguments, I'm pretty sure it's intended for this use case, as well. It should address this issue. >Function parameters can have default values which are calculated during function definition and saved. This proposal introduces a new form of argument default, defined by an expression to be evaluated at function call time.