Langchain prompt single braces

[JannisConen]

Goal: be able to use single braces in langfuse prompts later interacting with langchain

Why?
I am working a lot with generated latex which kind of revolves around { and }. Also, I am using langchain as a framework. Therefore I am not able to use { and } in my prompts on langfuse because then langchain expects them to hold variables inside them. To escape { and } for langchain, you would use {{ and }} but in langfuse {{ and }} circumenvent variables.

My quick suggestion
First replace all single { and } with temporary placeholders, then have the usual langfuse -> langchain prompt transformation and finally replace the temporary placeholders with double quotes.

I am a little unsure how this might impact the vast variety of prompts there is. Maybe some people use this as a feature to have variables in the prompt for langchain and not mark them variables for langfuse.

[CLAassistant]

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[greptile-apps]

Disclaimer: Experimental PR review

PR Summary

Introduced a mechanism to handle single braces {} in prompts for Langchain compatibility.

• Modified langfuse/model.py to replace single braces with placeholders before converting double braces for Langchain variables.
• Added a new test case test_get_langchain_prompt_with_braces in tests/test_langchain.py to verify single brace handling.
• Ensured backward compatibility and thorough testing to avoid edge cases.

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