if statement - If-else populate field error in Python (arcpy) -


i'm trying learn python , writing arcpy script arcgis 10.1. objective check variety of fields absent value (-99) , populate newly added field 0 value. code runs...however populates values 6 value. 6 part of problem, other part being i've checked , there should 3 (-99) values in table. 

below code.  # import arcpy module import arcpy  print "start engines" # script arguments shapefile = "c:\\gislab2\\python\\take_home\\uscancer2000.shp" #this arcpy.userargument part goes, re-exporting model. field_name = "henry1"  output_feature_class = "c:\\gislab2\\python\\take_home\\uscancer2000.shp"  # local variables: uscancer2000__2_ = output_feature_class  # process: add field arcpy.addfield_management(shapefile, "henry1", "long", "", "", "", "", "nullable", "non_required", "")  # process: calculate field arcpy.calculatefield_management(output_feature_class, "henry1", "5.5", "python_9.3", "") ## ### process: if-then check missing values ## if "cnt1"==-99:     field_name=0 elif "cnt2"==-99:     field_name=0 elif "cnt3"==-99:     field_name=0 elif "pop1"==-99:     field_name==0 elif "pop2"==-99:     field_name=0 elif "pop3"==-99:     field_name=0

you comparing constants in code.

is "cnt1"==-99 ??

that never true.

i not know arcpy, if want parse results functions should returned value or inspect variables passed parameters after call.


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