topic Re: Reclass python script not working in Python Questions

Reclass python script not working

JenniferDick — Tue, 14 Aug 2012 17:47:01 GMT

Hi,

I'm trying to reclass a vector field that has values from 1 to 7. I would like to reclass these values to 1's & 2's. For example:

if the value is 1 reclass it to 2
if the value is 2 reclass it to 2
if the value is 3 reclass it to 1

and so on.

Here is my script, but it is not working...any thoughts?

def Reclass( !Value! 😞
if ( !Value! = 1):
    return 2
if ( !Value! = 2):
    return 2
if ( !Value! = 3):
    return1
if ( !Value! = 4):
    return 1
if ( !Value! = 5):
    return 1
if ( !Value! = 6):
    return 1
if ( !Value! = 7):
    return 1

reclass( !Value! )

Re: Reclass python script not working

SolomonPulapkura — Tue, 14 Aug 2012 17:53:13 GMT

try double equals sign to compare

if ( !Value! == 1):

also your function call should be Reclass(!Value!)

Is Value the name of the field?

Re: Reclass python script not working

BruceBacia — Sun, 12 Dec 2021 02:24:11 GMT

Using a dictionary, you can avoid all of the if/thens

def Reclass( !Value! ):
    valueDict = {1 : 2, 2 : 2,
                     3 : 1, 4: 1,
                     5 : 1, 6 : 1,
                     7: 1} 
    !VALUE! = valueDict[!VALUE!]

Re: Reclass python script not working

JenniferDick — Tue, 14 Aug 2012 18:32:52 GMT

try double equals sign to compare
if ( !Value! == 1):
also your function call should be Reclass(!Value!)

Is Value the name of the field?

Yes, Value is the name of the field

Re: Reclass python script not working

JenniferDick — Tue, 14 Aug 2012 18:57:05 GMT

Thank you for your input...

I've tried both options and still no success.

Here is the error message I receive:

Failed to execute. Parameters are not valid
ERROR 000989: Python syntax error: Parsing error (type 'exceptions.SyntaxError'>: invalid syntax (line 1)
Failed to execute (CalculateField)

Re: Reclass python script not working

SolomonPulapkura — Sun, 12 Dec 2021 02:24:13 GMT

Try

def Reclass(n):
if ( n == 1):
return 2
....

Reclass( !Value! )

Re: Reclass python script not working

JenniferDick — Tue, 14 Aug 2012 19:31:06 GMT

[ATTACH=CONFIG]16950[/ATTACH]Still receive a generic error...

I've attached a screen shot of the field calculator. Note that the Weight field is the column I would like the changes to be placed and the Value field is what I want to reclassify.

I appreciate your time!

Re: Reclass python script not working

BruceBacia — Tue, 14 Aug 2012 20:42:14 GMT

Are these fields both integer?

Re: Reclass python script not working

JenniferDick — Tue, 14 Aug 2012 20:49:40 GMT

The Value field is a Float and the Weight field is integer

Re: Reclass python script not working

BruceBacia — Tue, 14 Aug 2012 20:59:28 GMT

this worked for me. You might want to double check that you are selecting "Python" at the top. I forgot several times while
testing 🙂

def Reclass(n):     valueDict = {1 : 2, 2 : 2, 3 : 1, 4 : 1, 5 : 1, 6 : 1, 7 : 1}      return valueDict   Weight =  Reclass(!Value!)

Re: Reclass python script not working

BruceBacia — Tue, 14 Aug 2012 21:00:44 GMT

This worked going integer to integer. It may be the float vs. integer problem that's hanging it up ?

Re: Reclass python script not working

JenniferDick — Wed, 15 Aug 2012 13:42:38 GMT

Thanks for all the comments. I have the calculation working now. It was the Float and Integer fields causing the problem.

Re: Reclass python script not working

DanielAmrine — Thu, 07 Mar 2013 19:07:33 GMT

What about going from text to float?

I am trying to do reclass based on a text value to calcualte a buffer distance....

def Reclass(!DRILLTYPE!)
if DRILLTYPE = U
    return 1177.5
elif DRILLTYPE = V
    return 744.9
elif DRILLTYPE = D
    return 744.9
elif DRILLTYPE = H
    return 1053.4

This is what i put into the codeblock but it keeps giving me the parse syntax error mentioned above. Do I need to reclass the tex into numbers first?

Thanks!
Dan