Solved

extracting a substring using python caller

9 years ago
December 8, 2016
6 replies
127 views

+8

arthy
Contributor

Hi,

I wrote a very long workspace and at some point I want to extract a substring of the filename using the python caller and have it as a new attribute in my workspace.

Then I tried to write a workspace with only that instruction (see attached) but I'm still having the same error:

Python Exception <KeyError>: 'fme_basename'

Error executing string `fme_basename=FME_MacroValues['fme_basename']


def thm(fme_basename):

    return fme_basename[4:]

'

Factory proxy not initialized

PythonFactory failed to process feature

PythonFactory failed to process feature
test.fmw

Any idea of what could be the problem?

Thanks

Best answer by david_r

Try this:

def thm(feature):
    basename = feature.getAttribute('fme_basename')
    if basename:
        basename = basename[4:]
        feature.setAttribute('fme_basename', basename)

Let me know if you don't understand what, how, etc.

View original

This post is closed to further activity.
It may be an old question, an answered question, an implemented idea, or a notification-only post.
Please check post dates before relying on any information in a question or answer.
For follow-up or related questions, please post a new question or idea.
If there is a genuine update to be made, please contact us and request that the post is reopened.

david_r
Best Answer
9 years ago
December 8, 2016

Try this:

def thm(feature):
    basename = feature.getAttribute('fme_basename')
    if basename:
        basename = basename[4:]
        feature.setAttribute('fme_basename', basename)

Let me know if you don't understand what, how, etc.

Upvote

+23

courtney_m
Contributor
9 years ago
December 8, 2016

You could use a SubstringExtractor within the long workspace, instead of the PythonCaller:

And you can set the Result Attribute name to whatever you want.

Upvote

david_r
9 years ago
December 8, 2016

You could use a SubstringExtractor within the long workspace, instead of the PythonCaller:

And you can set the Result Attribute name to whatever you want.

Yup, definitely a lot easier.

Upvote

+8

arthy
Author
Contributor
9 years ago
December 9, 2016

You could use a SubstringExtractor within the long workspace, instead of the PythonCaller:

And you can set the Result Attribute name to whatever you want.

Thanks @courtney_m.

It's a good alternative but it does not help me to understand the problem with the python caller.

Upvote

+8

arthy
Author
Contributor
9 years ago
December 9, 2016

Try this:

def thm(feature):
    basename = feature.getAttribute('fme_basename')
    if basename:
        basename = basename[4:]
        feature.setAttribute('fme_basename', basename)

Let me know if you don't understand what, how, etc.

@david_r,

Now I see my error.

I have also tried using fme macro values to get the attribute and I see with your suggestion that the good one is feature.getAttribute.

Many thanks

Upvote

david_r
9 years ago
December 9, 2016

@david_r,

Now I see my error.

I have also tried using fme macro values to get the attribute and I see with your suggestion that the good one is feature.getAttribute.

Many thanks

The FME_MacroValues dictionary is for published/private parameters only, where as the getAttribute() and setAttribute() methods are only for feature attributes.

If you want to learn more, I recommend this free webinar: http://www.safe.com/webinars/python-scripting-in-fme/

Upvote

Community Stats

Sign up

An FME Account is required to contribute

Login to the community

An FME Account is required to contribute