Is there a Pathlib alternate for os.path.join?

Yes there is:

env_path = Path(__file__).parent / ".env"

/ is all you need. This will work in different OSs

You can use something like this:

(Path(__file__).parent).joinpath('.env')

Documentation:

pathlib.Path.joinpath

Is the following definition of filepath closer in spirit to os.path.join?

import pathlib
main_dir = 'my_main_dir'
sub_dir = 'sub_dir'
fname = 'filename.tsv'
filepath = pathlib.PurePath(main_dir, sub_dir, fname)

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