Making one field/values equal to another field/values

Question

I have created a new field called "SFX" in a shapefile called "myshape.shp":

input = r"C:\files\myshape.shp"
arcpy.AddField_management(input, "SFX", "TEXT", field_length=100)

There is now a field called "SFX" but there are no values in the cells. Now, in that same shapefile, I have another field called "SUFFIX".

fields = [field.name for field in arcpy.ListFields(input)]
for field in fields:
 if field == 'SUFFIX':
 print field
>>>'SUFFIX'

Lets say 'SUFFIX' has values 'C', 'D', 'G', etc.... What I want to do, is for each row in 'SFX' I want that cell value to be equal to the corresponding cell value of 'SUFFIX'.

Without making complicated lists using a cursor, how would I do that using UpdateCursor or the Field Calculator?

Answer 1

Inserting the code shown below into your if statement should work.

# CalculateField_management (in_table, field, expression, {expression_type}, {code_block})
arcpy.CalculateField_management(in_table="myshape.shp",
 field="SFX",
 expression="!SUFFIX!",
 expression_type="PYTHON_9.3",
 code_block="")

Answer 2

If you are asking how to calculate SFX field = SUFFIX field then:

import arcpy
shapefile = r'C:\shapefile.shp'
fields = ['SFX','SUFFIX']
with arcpy.da.UpdateCursor(shapefile, fields) as cursor:
 for row in cursor:
 row[0]=row[1]
 cursor.updateRow(row)

Examples like this can be found if you read the help section of da.UpdateCursor.

Answer 3

Right click your SUFFIX field, Field Calculator.

In the code block,

SFX = !SUFFIX!