ArcPy rollback update / insert cursors if error occurs

Question

Is it possible to rollback an update made with an update cursor or an insert made with an insert cursor if an error occurs?

I need to go through a feature class and break numbers up into 100 groups. e.g.

num_start | num_end | other_value
---------------------------------
100       | 300     | foo

Needs to be:

num_start | num_end | other_value
---------------------------------
100       | 199     | foo
200       | 299     | foo
300       | 300     | foo

My update cursor changes the first row, and then the insert cursors inserts the remaining rows. The update and insert work fine, but when an error occurs the updated values remain causing the sequences to be incorrect, which of course means I need to re-export the feature class and start over again.

I am using Python 2.7.13.

Libraries: These are the libraries I import

import arcpy
from arcpy import env
import sys
import os
import logging
import time
from functools import partial # Allows function calls with parameters inside of dictionaries

What I tried: I though I could have a variable set before a try statement and then reset the data in an exception.

with arcpy.da.UpdateCursor(fc, "*") as updateCurs:
    oldValue = [] # initialize empty value
    for row in updateCurs:
        oldValue = [rowVal for rowVal in row] # read row into array
       try:
           # do stuff
           del updateCurs
       except Exception, e:
              # reset row to old row value
              for i in range(0, len(oldValue)):
                  row[i] = oldValue[i] # set row values
              # rollback
              updateCurs.updateRow(oldValue)

The problem here is that it would only correct the last row updated, but not the all the previous ones before it.

Row attributes: all other row attributes like geometry are set using the initial row being expanded, which currently are all points.

Answer 1

I discovered I can use the edit session with Arcpy's Editor class. http://desktop.arcgis.com/en/arcmap/10.3/analyze/arcpy-data-access/editor.htm

# Create an edit sessions
edit = arcpy.da.Editor(arcpy.env.workspace)

# start edit session
# undo = enabled
# multiuser = False to allow full control over a nonversioned / versioned dataset
edit.startEditing(with_undo = True, multiuser_mode = False)

#start operations used in edit sessions
edit.startOperation()

with arcpy.da.UpdateCursor(midpointFileName, "*") as updateCurs, \
     arcpy.da.InsertCursor(midpointFileName, "*") as insertCurs:

    #do update stuff then delete cursor
    del updateCurs

    #do insert stuff then delete cursor
    del insertCurs

# commit all changes
edit.stopOperation()

# stop edit sessions
# True = Save changes
edit.stopEditing(True)

This was able to revert changes made with both update and insert cursors.

To address Vince's comment:

This data is kept in a file geodatabase.

Data is currently not versioned.