In preparation for updating code to work with Python 3: don't use dict.values, dict.keys, dict.items anywhere; use the dict.iter* variants instead.
Also make it safe to create an ObjectGraph from an iteration; the previous code for the ObjectGraph constructor needlessly iterated through its input twice.
In preparation for updating code to work with Python 3: don't use dict.values, dict.keys, dict.items anywhere; use the dict.iter* variants instead.
Also make it safe to create an
ObjectGraphfrom an iteration; the previous code for theObjectGraphconstructor needlessly iterated through its input twice.