How to add field name in python in arcgis? -

i making 1 tool, , want save result of tool in field i've added. want give name field on basis of amenity selection (here i've given data type of amenity string. , added list of values in amenity parameter education, medical, transportation, etc.). if select "education" amenities field name "edu_ic". how can this? i've added code snippet below

def setupvulnerability():     gp = arc.create(9.3)          print(sys.version)       inputfc = gp.getparameterastext(0) # input feature class     print "inputfc:-'%s'" % (inputfc)      fields = gp.getparameterastext(1)     print "fields:-'%s'" % (fields)      fieldlist = fields.split(";")     print "fieldlist:-'%s'" % (fieldlist)      amenity = gp.getparameterastext(2)     print "amen:-'%s'" % (amenity)        all_field_names = [f.name f in arcpy.listfields(inputfc)]      field_name = none     try:           field in fieldlist:             field_name = field[0:3]+ "_" + "ic"             if field_name in all_field_names:                 continue             else :                 gp.addfield(inputfc , field_name , "float")             field_name = none     except:         raise error.scripterror()  if __name__ == '__main__':     setupvulnerability() 

i believe problem "amenity" variable, receives input user, not referenced when field being added.

something should work:

amenity = gp.getparameterastext(2)  if amenity == "education":      field_name = amenity[:3] + "_ic"      gp.addfield(inputfc, field_name, "float")