diff --git a/docs/modules/agents/implementations/natbot.py b/docs/modules/agents/implementations/natbot.py
index d9d24af1..3eff76a0 100644
--- a/docs/modules/agents/implementations/natbot.py
+++ b/docs/modules/agents/implementations/natbot.py
@@ -33,7 +33,6 @@ def run_cmd(cmd: str, _crawler: Crawler) -> None:
 
 
 if __name__ == "__main__":
-
     objective = "Make a reservation for 2 at 7pm at bistro vida in menlo park"
     print("\nWelcome to natbot! What is your objective?")
     i = input()
diff --git a/langchain/chains/summarize/__init__.py b/langchain/chains/summarize/__init__.py
index d0c9f35b..c6446f68 100644
--- a/langchain/chains/summarize/__init__.py
+++ b/langchain/chains/summarize/__init__.py
@@ -93,7 +93,6 @@ def _load_refine_chain(
     verbose: Optional[bool] = None,
     **kwargs: Any,
 ) -> RefineDocumentsChain:
-
     initial_chain = LLMChain(llm=llm, prompt=question_prompt, verbose=verbose)
     _refine_llm = refine_llm or llm
     refine_chain = LLMChain(llm=_refine_llm, prompt=refine_prompt, verbose=verbose)
diff --git a/langchain/sql_database.py b/langchain/sql_database.py
index 6c01b436..a03147d9 100644
--- a/langchain/sql_database.py
+++ b/langchain/sql_database.py
@@ -81,7 +81,6 @@ class SQLDatabase:
 
         tables = []
         for table_name in all_table_names:
-
             columns = []
             for column in self._inspector.get_columns(table_name, schema=self._schema):
                 columns.append(f"{column['name']} ({str(column['type'])})")