Create Dash-Langchain-app1.py

Blog/Dash-Langchain-app1.py

@@ -0,0 +1,32 @@
+from dash import Dash, dcc, html, callback, Input, Output
+from langchain.prompts import ChatPromptTemplate
+from langchain.chat_models import ChatOpenAI
+
+prompt = ChatPromptTemplate.from_template("tell me a joke about {foo}")
+api_key = "my-api-key-goes-here"
+model = ChatOpenAI(openai_api_key=api_key)
+chain = prompt | model
+
+app = Dash()
+
+app.layout = html.Div([
+   html.H1("Joke-Generating App"),
+   html.Label("Tell me a joke about: "),
+   dcc.Input(id='subject', debounce=True, maxLength=15),
+   html.Hr(),
+   html.Div(id='joke-placeholder')
+])
+
+@callback(
+   Output('joke-placeholder', 'children'),
+   Input('subject', 'value'),
+   prevent_initial_call=True
+)
+def update_layout(input_value):
+   joke = chain.invoke({"foo": input_value})
+   output = joke.content
+   return output
+
+
+if __name__ == "__main__":
+   app.run_server(debug=True)