Antony, On 2/21/2014, 9:13 PM, Antony Lee wrote:
Currently, mappingproxies are not picklable, which (among other things) lead to signature objects being non picklable. Could this be easily fixed, or is there a stronger reason for not allowing that pickling? If mappingproxies cannot be made picklable, perhaps signatures can implement __getnewargs__ to allow pickling? Antony
Good catch. I think we'll make Signatures picklable in 3.5 (http://bugs.python.org/issue20726) It can be implemented using __reduce__ and __setstate__ methods. We can't use __getnewargs__ as we have keyword-only arguments in Parameter and Signature classes (but maybe we'll be able to use __getnewargs_ex__ in 3.5) Do you have any other reasons to make mappingproxies picklable? Yury