Parseltounge is a stupid programming language

foot gun: https://pylint.readthedocs.io/en/latest/user_guide/messages/warning/dangerous-default-value.html
whitespace indentation
no privacy
underscore vars, methods, and files are just pretend private
double underscore names cause mangling to avoid shadowing
you have to list self as a parameter
no block comments
clumsy entry points: if __name__ == '__main__':
pass, because we can't do empty scopes 🙄
custom ternaries: client_data['client_id'] if dynamically_registered else _config.get("client_id", "")

Minor quibbles