Arcpy uses the updatelayer function to change the symbol system of the layer

【 Introduce 】：

arcpy.mapping Inside updatelayer Function has the function of updating the layer symbol system , It can also be used to update various layer attributes , As a multifunctional function , You need to master the use of its parameters .

【 Before processing 】：

【 Code example 】：

【 The code analysis 】：
[ first line ]： Import arcpy.mapping modular ;
[ The second line ]： Reference the current map document , And assign to variable ;
[ The third line ]： Get a reference to the data frame ;
[ In the fourth row ]： Define the layer to be updated ; If you update the symbol system of the layer , It must be ensured that the updated layer and the source layer have the same geometry （ spot 、 Line 、 Noodles ）, Also check whether the attribute definitions are the same , Grading colors and grading symbols are based on a specific attribute .
[ The fifth row ]： Define the source layer used to update the symbology ;
[ Sixth elements ]： call updatelayer Function to update the symbology ;True It means that only the symbol system of the layer is updated , Do not update attribute information .

【 After processing 】：

【 Result analysis 】： Change from grading color to grading symbol .

【 Statement 】： The code and data are from the books of teacher mu Naixia .