kamilwu commented on pull request #13355:
URL: https://github.com/apache/beam/pull/13355#issuecomment-744439272


   Thank you @rgruener 
   
   The recommended way to set up a custom label for a PTransform is using this 
syntax: `pipeline | 'my custom label' >> MyTransform()`. I'm not sure why some 
combiners (`ToList`, `ToSet` and `ToDict`) define their own constructor with 
`label` parameter, but it's probably legacy code. I think you can safely remove 
these constructors. 
   
   Don't worry about default labels - they are inferred from the class name:
   
https://github.com/apache/beam/blob/fc42781108a05c7b8a16a73310bc23674d7e3175/sdks/python/apache_beam/transforms/ptransform.py#L363-L365


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