Multiple Conditionals String with ArcGIS Field Calculator?

Question

I am trying to use Field Calculator to use a multiple conditional based on a string in another field of the same attribute table.

enter image description here

I have written the code below, but without success.

Pre-Logic Script Code:

def hazardValue( !Group! )
 if !Group! = '1.1':
 return 1
 if !Group! = '1.2':
 return 2
 if !Group! = '1.5':
 return 4 
 if !Group! = '2.1':
 return 3
 else
 return 5

Hazard =

hazardValue( !Group! )

It is always returning an error:

There was a failure during processing, check the Geoprocessing Results window for details

• Michael Stimson: the !Group! is out of scope for the code block. Take out the exclamation marks in the code block only and change the assignment equals (=) to a conditional equals (==) then it should work. You will also need a colon on the else: statement and at the start def hazardValue(Group):
• Midavalo: Welcome to GIS SE! As a new user please take the tour to learn about our focused Q&A format. Please always include error messages as text as images sometimes don't display well on some devices, and text is also searchable (to help others find similar messages).
• Midavalo: Also your message says "check the Geoprocessing Results window" - did you do that? The full error message will be contained in there.

Answer 1

You're pretty close I think. In an if statement, you need double equals ==, and you are passing your !Group! in your expression into a new variable (myfield) in your function.

Pre-Logic Script Code:

def hazardValue(myfield):
 if myfield == '1.1':
 return 1
 elif myfield == '1.2':
 return 2
 elif myfield == '1.5':
 return 4 
 elif myfield == '2.1':
 return 3
 else:
 return 5

Hazard =

hazardValue(!Group!)