Difference between two lines in the documentation

Beginner Questions
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1

Besides the comment lines, can someone tell me what is the difference between these 2? Thanks.

# Here we specify the filter input explicitly
median = itk.MedianImageFilter.New(reader.GetOutput())
# Same as above but shortened. Input does not have to be specified.
median = itk.MedianImageFilter.New(reader.GetOutput())

This comes from the (Quick start guide)[Quick start guide — ITKPythonPackage documentation]

For what is worth, I just realised that there is a repo for the Python interface of ITK (separate from the base repo). The corresponding lines are here: ITKPythonPackage/ImplicitInstantiation.py at 9414dc73f8ca9f29fb607c1f1317901a27d55ae6 · InsightSoftwareConsortium/ITKPythonPackage · GitHub

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This was accidentally refactored last year. PR 188 should fix it.

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That really helped me to understand the difference, thank you.

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