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how to change only value of UniqueValuesSymbology without changing the symbols?

Question asked by kumarnv0102 on Sep 26, 2018

HI,

 

I have many MXD using same feature class and it is symbolized in the same way.

Currently, highway symbol has values 100,101 and I want to change this value to 200 and 201 without changing the symbols.

 

when I update the mxd using Arcpy, it updates the values and also symbols.

is there any way to capture the symbols from uniquevaluessymbology or only to update the values?

 

my code is 

slist = [200,201]

lyr.symbology.classValues = slist

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