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Module: undo bkchem/undo.py

this module implements undo_manager and state_record classes, should provide everything needed to perform undo management. state_record is used only inside of undo_manager and is not exported in __all__.

Imported modules   
import copy
import data
import misc
from types import *
Classes   

state_record

class able to store state of the whole system and then set

undo_manager

class to process requests for undo tracking and undoing


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