streaming.py

from langchain_core.callbacks.base import BaseCallbackHandler

class StreamHandler(BaseCallbackHandler):

    def __init__(self, container, initial_text=""):
        self.container = container
        self.text = initial_text

    def on_llm_new_token(self, token: str, **kwargs):
        self.text += token
        self.container.markdown(self.text)