Slot name with "illegal character" should be flagged?

Rasa Core version: 0.12.1 (but the master has the same issue)

Python version: 3.6.6

Operating system (windows, osx, …): Linux

Issue: I had slot name with dot e.g. my_company_name.special_slot this works as long as it is not used in a template but because the substitute is done with python built-in format, dot notation won’t work.

https://github.com/RasaHQ/rasa_core/blob/master/rasa_core/nlg/template.py#L79

I did the easy workaround of removing dot but perhaps either (a) allow dot in slot by updating _fill_template_text function or (b) when domain file is passed, check and see if slot name with invalid python variable name is also used in template. if so error out Would be helpful

[wochinge]

Super nice 🚀 Thanks! Let me know if you have questions

[wochinge]

@naoko Awesome! I discuss it with the team and come back to you 👍