Python script from ModelBuilder - mysterious bits of code at the beginning and end

IlkaIllers1 — Sat, 17 Jun 2023 00:12:05 GMT

Hello!

I exported a model from modelbuilder to python and am confused about these bits at the beginning:

from sys import argv
def FeatureClassGenerator(workspace, wild_card, feature_type, recursive) :
with arcpy.EnvManager(workspace = workspace):

dataset_list = [""]
if recursive:
datasets = arcpy.ListDatasets()
dataset_list.extend(datasets)

for dataset in dataset_list:
featureclasses = arcpy.ListFeatureClasses(wild_card, feature_type, dataset)
for fc in featureclasses:
yield os.path.join(workspace, dataset, fc), fc

as well as at the end:

if __name__ == '__main__':
# Global Environment settings
with arcpy.EnvManager():
Model(*argv[1:])

I can remove the one at the beginning without seeing an impact, but if I remove the one at the end, the model doesn't run in the python IDE. I never would have written anything like this had I started from scratch. What is happening here? Do I need this in other scripts too?

Thank you!

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Python script from ModelBuilder - mysterious bits of code at the beginning and end