Field calculator

[FOUADHAMDAN_SAAD]

Hi community....

I need your help to create python script  to calculate the value of  the field that called "code" type short integer according to following condition:

def reclass(industrial_area):

if (industrial_area > two_third_neigh_area):

return 13

elif (industrial_area > one_third_neigh_area and industrial_area< two_third_neigh_area):

return 16

elif (industrial_area < one_third_neigh_area):

return unclassified 

 I tried to apply the above if statement but I got this message:

[DanPatterson]

The def needs to have the other field names passed to it since it has no values for them.  You only pass the function 1 field name (industrial_area).  And I would check ArcMap's syntax for passing field names to functions eg do they need to be enclosed in square brackets, exclamation marks like in ArcGIS Pro)

[KimGarbade]

You didn't include the other fields you were comparing in the function definition.

[JayantaPoddar · Accepted solution]

In the reclass() function you have defined a single variable "industrial_area", whereas you have called three variables in the code "industrial_area", "one_third_neigh_area", "two_third_neigh_area".

You should add three variables in the function, and also define the appropriate fields in the expression.

Moreover, I don't understand "unclassified"? If this is a value, it won't fit in a Short integer type. You could replace it with values like 0 or 99.

e.g.: Assuming the layer has three numeric fields viz., "industrial_area", "one_third_neigh_area", "two_third_neigh_area"

Expression:

reclass(!industrial_area!, !one_third_neigh_area!, !two_third_neigh_area!)

Code Block:

def reclass(industrial_area, one_third_neigh_area, two_third_neigh_area):
    if (industrial_area > two_third_neigh_area):
        return 13
    elif ((industrial_area > one_third_neigh_area) and (industrial_area< two_third_neigh_area)):
        return 16
    elif (industrial_area < one_third_neigh_area):
        return 99

[FOUADHAMDAN_SAAD]

Thank you Sir.

I applied that and it is work perfectly. 

I appreciate all replays.