Update Field from Multiple Field(s)

ModernGIS

I have been looking around the internet all morning to figure out how to write a Python script to accomplish what I need to do, and so far, I am not finding what I need. Need to see if someone can start me in the correct direction.

I have (2) text fields:

   ACALARA TYPE and ACALARA MODEL with coded meter type attributes

Another field:

   ACALARA METER TYPE will hold the actual Meter Type 

The data in the first two fields is held in a different database and I have a Python script built that will take that data and update these Feature Class Fields. 

What I need to do is build a second python script that is composed of an if/else statement.

EXAMPLE:

   If ACALARA TYPE = 75 and ACALARA MODEL = 130

      Then the ACALARA METER TYPE field will update to show "CEN3S4S20"

   If ACALARA TYPE = 109 and ACALARA MODEL = 2

      Then the ACALARA METER TYPE field will update to show "UMT2.1"

There are around 2 dozen other combinations with additional Meter Type outputs that I will have to include

Figuring out how to write this code will help with other Feature Classes that I have been updating manually.

Thank You 

curtvprice

Line 20 is where you call my function. This function seems to be working correctly though. 

>>> proc(75, 130)
'CEN3S4S20'
>>> proc(109, 2)
'UMT2.1'

>> proc(109,4)
Runtime error
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "<string>", line 10, in proc
Exception

Note, my code is assuming the actype and acmodel fields are numeric and your output field is string.

I will update the code to more gracefully handle unhandled combinations, there is a syntax error in my raise statement.

UPDATE: after my fix:

>>> proc(109,4)
Runtime error
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "<string>", line 12, in proc
Exception: Unhandled case: proc(109, 4)
>>>