Python Caller calculate field based on other attributes.

Hi @jlgvii

While it is definitely possible to set values based on conditions using a PythonCaller, a better method within FME would be to use conditional values within an AttributeManager or AttributeCreator. No Python required.

I would recommend taking a look at this article on conditional values if this is something you want to try:

https://knowledge.safe.com/articles/34109/determining-attribute-values-by-testing-with-condi.html

I entirely agree with @debbiatsafe, it's much easier doing this with regular transformers and a conditional value, especially if you have little or no prior experience with Python.

However, for reference, this is what the above might look like in Python:

import fme

def quadrant(feature):
    NorthAzimuth = int(feature.getAttribute('NorthAzimu'))
    if NorthAzimuth >= 0 and NorthAzimuth < 90:
        quad = 'N' + str(NorthAzimuth) + 'E'
    elif NorthAzimuth >= 90 and NorthAzimuth < 180:
        quad = 'N' + str(180 - NorthAzimuth) + 'E'
    elif ... # other criteria follows the same pattern

    feature.setAttribute('Quadrant', quad)

This will output the attribute 'Quadrant' with the result based on the input attribute 'NorthAzimu'.

Thanks this worked perfectly and will help greatly in other work as well. Thanks so much.

import fme

def quadrant(feature):
    NorthAzimuth = int(feature.getAttribute('NorthAzimu'))
    if NorthAzimuth >= 0 and NorthAzimuth < 90:
        quad = 'N' + str(NorthAzimuth) + 'E'
    elif NorthAzimuth >= 90 and NorthAzimuth < 180:
        quad = 'N' + str(180 - NorthAzimuth) + 'E'
    elif ... # other criteria follows the same pattern

    feature.setAttribute('Quadrant', quad)

I appreciate the response. As I had tried to get this to work for a decent amount of time. But conditional values did get me the results I was looking for.