Tips/lessons learned for writing a Python powered DSL?

[python at bdurham.com]

Looking for tips and lessons learned (advice on what to do and
not do) for writing a Python based DSL.

Googling python dsl yields some wonderful content which I've just
started to read. If there are specific articles or 3rd party
libraries that you used to implement a DSL, I would appreciate
hearing about them.

Thank you,
Malcolm
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