Re: [Python-ideas] An identity dict

Raymond Hettinger <raymond.hettinger@...> writes:

Also, there hasn't been much discussion of implementation, but unless you're willing to copy and paste most of the code in dictobject.c, you're going to end-up with something much slower than d[id(obj)]=value.

A slightly hacky way to implement this on CPython without copying much would be to implement __getitem__, and __setitem__ in C and subclass it in Python to call those methods in the rest of dictionary implementation.