topic Re: IF STATEMENT Calculate Field Help ArcPro in ArcGIS Online Questions

IF STATEMENT Calculate Field Help ArcPro

ABM2021 — Fri, 12 Nov 2021 16:13:42 GMT

Hello everyone. I am new to coding and need some help using the calculate field option.

I have one field (!ARA!) and another field (!Class!). When area is a certain size, I would like to change the attribution of !Class! to be either 25, 50, 100, or 200.

Should the field name be !Class!?

Expression type : Python 3

What should the expression be?

Is this the correct code block?

def Reclass(!ARA!):
if !ARA! is <= 1000:
return 25
elif !ARA! >= 1000:
return 50
elif !ARA! >= 2000:
return 100
elif !ARA! >= 5000:
return 150

I keep getting syntax errors. I will appreciate any help! Thank you in advance.

Re: IF STATEMENT Calculate Field Help ArcPro

JoeBorgione — Fri, 12 Nov 2021 18:50:43 GMT

def Reclass(!ARA!): if !ARA! is <= 1000: return 25 elif !ARA! >= 1000: return 50 elif !ARA! >= 2000: return 100 elif !ARA! >= 5000: return 150

We can't tell if you've properly indented your def() as well as your if/elif so here ^ is what it should look. That said I think your error is passing !ARA!. Instead of passing that directly, try this approach:

def Reclass(inValue): if inValue is <= 1000: return 25 elif inValue >= 1000: return 50 elif inValue >= 2000: return 100 elif inValue >= 5000: return 150

In your field calculator, enter :

reclass(!ARA!)

in the upper window.

Is !ARA! numeric? If not that will be an issue as well.

Your logic is a little bit flawed as well: if !ARA! == 1,000 what value do you really want?

Re: IF STATEMENT Calculate Field Help ArcPro

KenBuja — Fri, 12 Nov 2021 16:55:55 GMT

The code won't work as expected. The If statement will be satisfied with the first condition that evaluated to true, so inValue = 5000 would return 50. You want the logic to be like this instead.

def Reclass(inValue): if inValue is <= 1000: return 25 elif inValue < 2000: return 50 elif inValue < 5000: return 100 else: return 150