refactor chain_type_help

AI_CHANGELOG.md

@@ -40,4 +40,4 @@ Tue Sep 26 12:56:59 2023 +0000
 - The numpy and tornado packages were added to the requirements.txt file. These packages are not directly required by our application but were added to avoid potential vulnerabilities as suggested by Snyk.
 ## [Updated token used for code checkout in GitHub workflow](https://github.com/joshuasundance-swca/langchain-streamlit-demo/commit/b0c4e1ca12f86ea6113ee2c86d38c39d3035f395)
 Tue Sep 26 08:56:55 2023 -0400
-- In the GitHub Actions workflow file 'ai_changelog.yml', the personal access token used for checking out code has been updated. The token has been changed from 'PAT' to 'WORKFLOW_GIT_ACCESS_TOKEN'.
+- In the GitHub Actions workflow file 'ai_changelog.yml', the personal access token used for checking out code has been updated. The token has been changed from 'PAT' to 'WORKFLOW_GIT_ACCESS_TOKEN'.

langchain-streamlit-demo/app.py

@@ -199,20 +199,15 @@ with sidebar:
         chain_type_help_root = (
             "https://python.langchain.com/docs/modules/chains/document/"
         )
-        chain_type_help_dict = {
-            chain_type_name: f"{chain_type_help_root}/{chain_type_name}"
+        chain_type_help = "\n".join(
+            f"- [{chain_type_name}]({chain_type_help_root}/{chain_type_name})"
             for chain_type_name in (
                 "stuff",
                 "refine",
                 "map_reduce",
                 "map_rerank",
             )
-        }
-
-        chain_type_help = "\n".join(
-            f"- [{k}]({v})" for k, v in chain_type_help_dict.items()
         )
-
         document_chat_chain_type = st.selectbox(
             label="Document Chat Chain Type",
             options=["stuff", "refine", "map_reduce", "map_rerank"],