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I’m picturing something like this:

@extract_columns("a column foo", ...)
def my_df(...) -> pd.DataFrame:
   return ...

In short: no. Why? Hamilton requires that everything needs to be a valid python variable name. E.g. you can’t have a function with a parameter name that includes whitespace that would depend on that column, because python doesn’t allow whitespace in a parameter names. E.g. this isn’t valid python code:

def a_transform(a column foo: pd.Series) -> ...

OK Thanks!