# import arcpy and set path
import arcpy
import numpy
path = 'C:/Users/Something Wicked/Desktop/Work/Python/Python Scripts/Python Code Project/Sumner County Files'
arcpy.env.workspace = path

#Update Feature Class
COUNTY = 'Sumner_County'
FEATURE = 'SumnerGCS83_joined'
UTheme = arcpy.da.UpdateCursor((FEATURE + '.shp'), ['THEME1','THEME2','THEME3','THEME4']) # You're trying to convert to string text that's already a string str('.shp')
for row in UTheme:
    if row == 1:
        row = 'Early Exploration'
        elif row == 2:
            row = 'Early Settlement'
        elif row == 3:
            row = 'Agriculture'
        elif row == 4:
            row = '  '
        elif row == 5:
            row = 'Transportation'
        elif row == 6:
            row = 'Religion/Philosophy Movements & Leaders'
        elif row == 7:
            row = 'Political/Government'
        elif row == 8:
            row = 'Military Affairs'
        elif row == 9:
            row = 'Education'
        elif row == 10:
            row = 'Science & Technology'
        elif row == 11:
            row = 'Art & Technology'
        elif row == 11:
            row = 'Society & Customs'
        elif row == 13:
            row = 'Humanitarian'
        elif row == 99:
            row = 'Other'
        # Update the cursor with the updated list
        cursor.updateRow(row)
del UTheme