create app.py

app.py

@@ -0,0 +1,33 @@
+import langchain_helper as lch
+import streamlit as st
+import textwrap
+
+
+st.title("YouTube Assistant(Question Answering app based on youtube video)")
+
+with st.sidebar:
+    with st.form(key='my_form'):
+        youtube_url = st.sidebar.text_area(
+            label="Paste the youtube video URL",
+            max_chars=50
+        )
+
+        query = st.sidebar.text_area(
+            label="Ask me anything based on the video",
+            max_chars=50,
+            key="query"
+        )
+
+        "[Get an OpenAI API key](https://platform.openai.com/account/api-keys)"
+
+        with st.sidebar:
+            submit_btn = st.form_submit_button(label="Ask")
+
+
+if query and youtube_url and submit_btn:
+    with st.spinner("Wait while I query the video..."):
+        db = lch.create_vector_db_from_ytUrl(youtube_url)
+        response, docs = lch.get_response_from_query(db, query)
+
+        st.subheader(f"You asked: {query}. Here is what I got:")
+        st.text(textwrap.fill(response, width=80))