How to append Extent object to existing dictionary key values?

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I have a dictionary whose keys are map segment names, and whose value is a list of 3 field values.

Using an arcpy.da.SearchCursor on the map segments FeatureLayer, I have extracted the extent object and the names for the segments.

Using the similar map segment names, I want to append the extent values to the dictionary keys (so that I can reference them later). How would I do this, you cant index an Extent object.

for instance:{'m32': [7, 10, 13], 'm33': [7, 10, 13]}...turns into something like:{'m32': [7, 10, 13,XMin,Ymin,XMax,YMax], 'm33': [7, 10, 13,XMin,Ymin,XMax,YMax]}...

so that when I index it, I can index the key, the original values, and index the extent values.



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