What’s the advantage of a trailing underscore in Python naming?

Question

I am used to naming Python arguments in this way:

my_argument='foo'

what’s the advantage if I do this instead:

my_argument_='foo"

as is recommended by PEP008?

There must be a good reason for the trailing underscore, so what is it?

Answer

Exactly what it gives in the PEP: it allows you to use something that would otherwise be a Python keyword.

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Accepted Answer

Exactly what it gives in the PEP: it allows you to use something that would otherwise be a Python keyword.as_with_for_in_