I have a feature class with two fields I am interested in using. One field is "area_acres" and the other is "Survey_Pcnt". I have calculated the field "area_acres". My intent is to sum all the values in the field "area_acres" and then use that "summed_total" in the following expression to calculate the "Survey_Pcnt" field: "!area_acres!/summed_total*100". I have managed to sum all the values successfully, but when I try to add summed_total as a variable in the expression and run the script I get the error: TypeError: unsupported operand type(s) for /: 'str' and 'float'. This error leads me to believe I'm trying to perform division between a string and floating point which wouldn't work. Below is my code that I'm having trouble with.
summed_total = sum((r for r in arcpy.da.SearchCursor(env.workspace + "/APE_intersect_dissolve_adequacy", ['area_acres'])))
percentage_expression = "(float(!area_acres!))"/float(summed_total)*"(float(100))"
arcpy.CalculateField_management(env.workspace + "/APE_intersect_dissolve_adequacy","Survey_Pcnt", percentage_expression, "PYTHON_9.3")
I have tried writing the percentage_expression many different ways to no avail. At this point any help is greatly appreciated. Let me know if there is any other information I can provide. I am using ArcGIS desktop 10.7.1 and arcpy.