javapythonobject-identity

Is there a Python equivalent of Java's IdentityHashMap?

I'm walking a data structure and would like to build a dict mapping X->Y, where X is a field in the data structure I'm walking and Y is a field in the data structure I'm building on the fly. X is an unhashable type.

Solution

  • Trivially:

    idmap = {}
idmap[id(x)] = y

    Use the id of x as the dictionary key