+1Hi, I have a strange issue in this sampler tool which relates to a python syntax in a private parameter. The CT is based on an old tool that used to be on the hub. I have updated it, but it fails to work if parameters are set from outside the CT. If they are hard coded, then the tool works just fine. Any ideas?
Miika
You may not need to use this custom transformer anymore, the regular Sampler now has a "randomize sampling" option
+1You may not need to use this custom transformer anymore, the regular Sampler now has a "randomize sampling" option
I had a look and I agree that FME behaves weirdly, might be a bug.
The code that crashes is the scripted private parameter "RandomizerPercentagePython" which references:
FME_MacroValues['RandomizerPercentage']When it crashes, the error message shows the following reference, however:
FME_MacroValues['RandomizedSampler_WORKSPACE_NAME']So I have the impression that FME tries to do something clever about resolving the published parameter names inside the scripted parameter, but fails.
I'd report this to Safe as a potential bug.
Here's a workaround that confuses FME sufficiently to not mess with the scripted parameter. Modify the script inside the private parameter "RandomizerPercentagePython" as follows:
return (100/float(FME_MacroValues.get('RandomizerPercentage')))Just be aware that this won't work properly if you have several instances of the RandomizedSampler transformer with different values for RandomizerPercentage.
Hi @miikamakela, I don't know why the published parameter won't be evaluated in a scripted parameter defined in a custom transformer, but it seems to be a de facto limitation in the current FME.
As a workaround, how about this modification?
Here's a workaround that confuses FME sufficiently to not mess with the scripted parameter. Modify the script inside the private parameter "RandomizerPercentagePython" as follows:
return (100/float(FME_MacroValues.get('RandomizerPercentage')))Just be aware that this won't work properly if you have several instances of the RandomizedSampler transformer with different values for RandomizerPercentage.
import fme
return (100/float(fme.macroValues['RandomizerPercentage']))
import fme
return (100/float(fme.macroValues['RandomizerPercentage']))
Here's a workaround that confuses FME sufficiently to not mess with the scripted parameter. Modify the script inside the private parameter "RandomizerPercentagePython" as follows:
return (100/float(FME_MacroValues.get('RandomizerPercentage')))Just be aware that this won't work properly if you have several instances of the RandomizedSampler transformer with different values for RandomizerPercentage.
The code below seems to work, and it also uses the local instance parameter rather than the global parameter:
import fme
percentage = fme.resolveFMEMacros(FME_MacroValues['RandomizerPercentage'])
return 100/float(percentage)
@takashi: The above gets automatically "translated" to the following when FME runs:
import fme
percentage = fme.resolveFMEMacros(FME_MacroValues[FME_MacroValues['RandomizedSampler_WORKSPACE_NAME'] + '_' + 'RandomizerPercentage'])
return 100/float(percentage)
The code below seems to work, and it also uses the local instance parameter rather than the global parameter:
import fme
percentage = fme.resolveFMEMacros(FME_MacroValues['RandomizerPercentage'])
return 100/float(percentage)
@takashi: The above gets automatically "translated" to the following when FME runs:
import fme
percentage = fme.resolveFMEMacros(FME_MacroValues[FME_MacroValues['RandomizedSampler_WORKSPACE_NAME'] + '_' + 'RandomizerPercentage'])
return 100/float(percentage)
I've never seen a comprehensive documentation on the Python fme module. Could you tell me where you found the description on the fme.resolveFMEMacros function?
I've never seen a comprehensive documentation on the Python fme module. Could you tell me where you found the description on the fme.resolveFMEMacros function?
See also the comment from @stephenwu further down.
Documentation: http://docs.safe.com/fme/2017.0/html/FME_Desktop_Documentation/FME_Workbench/Configuration/FME_BEGIN_PYTHON.htm
I've never seen a comprehensive documentation on the Python fme module. Could you tell me where you found the description on the fme.resolveFMEMacros function?
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