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app.py

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+import streamlit as st
+from langchain.llms import OpenAI
+from langchain.agents import load_tools, initialize_agent, AgentType
+import os
+
+# Set up Streamlit interface
+st.title('Weather Q&A using Langchain')
+# Adding the markdown message
+st.markdown("""
+I'm genuinely impressed. Leveraging prompt engineering, I was able to craft this program in just 5 minutes, and it's fully functional! All I did was instruct ChatGPT to integrate langchain and streamlit, set up inputs for the API keys, pose a weather-related question, and use the details from the [LangChain OpenWeatherMap link](https://python.langchain.com/docs/integrations/tools/openweathermap) as a coding and output guide. Now, envisioning a solution is all it takes. It's auto-magical! I may have been a terrible programmer, but I\'m an amazing prompt engineer, bless the Lord!
+""")
+
+st.sidebar.header('API Configuration')
+
+# Input for OpenAI API key and OpenWeather API key in the Streamlit sidebar
+os.environ["OPENAI_API_KEY"] = st.sidebar.text_input('OpenAI API Key:', value='', type='password')
+os.environ["OPENWEATHERMAP_API_KEY"] = st.sidebar.text_input('OpenWeather API Key:', value='', type='password')
+
+# Input for question about the weather
+question = st.text_input('Ask a question about the weather (e.g., "What\'s the weather like in London?"):')
+
+# Initialize Langchain's OpenAI and agent_chain only once API keys are provided
+if os.environ["OPENAI_API_KEY"] and os.environ["OPENWEATHERMAP_API_KEY"]:
+    try:
+        llm = OpenAI(temperature=0)
+        tools = load_tools(["openweathermap-api"], llm)
+        agent_chain = initialize_agent(
+            tools=tools, llm=llm, agent=AgentType.ZERO_SHOT_REACT_DESCRIPTION, verbose=True
+        )
+
+        # If a question is provided, proceed to get an answer
+        if question:
+            response = agent_chain.run(question)
+            st.write(response)
+    except Exception as e:
+        st.warning("There was an error processing your request.")
+        st.write(f"Details: {e}")
+        st.write("Please provide more specific information. For example, you may need to provide the country sucn as Florence Kentucky US.")
+else:
+    st.warning("Please provide your API keys in the left sidebar!")

requirements.txt

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+streamlit
+openai
+langchain
+pyowm