Using CalculateField within a script tool to edit the shape of a polygon

Question

I am working in ArcGIS Pro 3.2 and with Python 3.9.18

I am trying to replace the geometry of a polygon with the polygon from another layer. I have used this small calculate field expression to replace geometry and it works great!

enter image description here

I am hoping to create a tool so that individuals who are not as tech savvy can use it to replace geometry. I have tried to embed this expression into a script as shown:

import arcpy
def replaceGeometry(inLayer,geomLayer):
 fieldName = 'SHAPE'
 expression = "replaceGeometry()"
 codeblock = """
G = arcpy.Geometry()
geomList = arcpy.management.CopyFeatures('{geomLayer}',G)
def replaceGeometry():
 return geomList[0]"""
 
 # Run CalculateField 
 arcpy.management.CalculateField(in_table=inLayer,field= 'SHAPE', expression= 'replaceGeometry()',
 expression_type= "PYTHON3", code_block= codeblock)
def script_tool(param0,param1):
 arcpy.AddMessage(f'The name of the Authoritative Layer chosen is: {param0}')
 arcpy.AddMessage(f'The name of the Geometry Layer chosen is: {param1}')
 replaceGeometry(param0,param1)
if __name__ == "__main__":
 param0 = arcpy.GetParameterAsText(0)
 param1 = arcpy.GetParameterAsText(1)
 script_tool(param0,param1)

I get this error:

NameError: name 'geomLayer' is not defined

Note: when I use the name of the layer in the expression it runs successfully as such:

 codeblock = """
G = arcpy.Geometry()
geomList = arcpy.management.CopyFeatures('Poly_2',G)
def replaceGeometry():
 return geomList[0]"""

So how do I correctly use param1 as a variable in the CalculateField method within a script tool? That way the layer is not hardcoded in.

Answer 1

I figured out the issue. I needed to make the code block an f string. Like this

import arcpy
arcpy.env.overwriteOutput = True
def replaceGeometry(inLayer,geomLayer):
 fieldName = 'SHAPE'
 expression = "replaceGeometry()"
 codeblock = f"""
G = arcpy.Geometry()
geomList = arcpy.management.CopyFeatures('{geomLayer}',G)
def replaceGeometry():
 return geomList[0]"""
 
 # Run CalculateField 
 arcpy.management.CalculateField(in_table=inLayer,field= 'SHAPE', expression= 'replaceGeometry()',
 expression_type= "PYTHON3", code_block= codeblock)
def script_tool(param0,param1):
 arcpy.AddMessage(f'The name of the Authoritative Layer chosen is: {param0}')
 arcpy.AddMessage(f'The name of the Geometry Layer chosen is: {param1}')
 replaceGeometry(param0,param1)
if __name__ == "__main__":
 param0 = arcpy.GetParameterAsText(0)
 param1 = arcpy.GetParameterAsText(1)
 script_tool(param0,param1)