Diff between object graphs?
cfkaran2 at gmail.com
Wed Apr 22 12:07:25 CEST 2015
Hi all, I need some help. I'm working on a simple event-based simulator for my dissertation research. The simulator has state information that I want to analyze as a post-simulation step, so I currently save (pickle) the entire simulator every time an event occurs; this lets me analyze the simulation at any moment in time, and ask questions that I haven't thought of yet. The problem is that pickling this amount of data is both time-consuming and a space hog. This is true even when using bz2.open() to create a compressed file on the fly.
This leaves me with two choices; first, pick the data I want to save, and second, find a way of generating diffs between object graphs. Since I don't yet know all the questions I want to ask, I don't want to throw away information prematurely, which is why I would prefer to avoid scenario 1.
So that brings up possibility two; generating diffs between object graphs. I've searched around in the standard library and on pypi, but I haven't yet found a library that does what I want. Does anyone know of something that does?
Basically, I want something with the following ability:
Object_graph_2 - Object_graph_1 = diff_2_1
Object_graph_1 + diff_2_1 = Object_graph_2
The object graphs are already pickleable, and the diffs must be, or this won't work. I can use deepcopy to ensure the two object graphs are completely separate, so the diffing engine doesn't need to worry about that part.
Anyone know of such a thing?
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