diff --git a/src/chatdbg/__main__.py b/src/chatdbg/__main__.py
index 9a5777b..b070763 100644
--- a/src/chatdbg/__main__.py
+++ b/src/chatdbg/__main__.py
@@ -1,6 +1,7 @@
 from .chatdbg_pdb import *
 import ipdb
 
+
 def main():
-    ipdb.__main__._get_debugger_cls = lambda : ChatDBG
+    ipdb.__main__._get_debugger_cls = lambda: ChatDBG
     ipdb.__main__.main()
diff --git a/src/chatdbg/assistant/assistant.py b/src/chatdbg/assistant/assistant.py
index ca6949e..3bfe65d 100644
--- a/src/chatdbg/assistant/assistant.py
+++ b/src/chatdbg/assistant/assistant.py
@@ -37,13 +37,16 @@ def __init__(
         try:
             self.client = OpenAI(timeout=timeout)
         except OpenAIError:
-            print(textwrap.dedent("""\
+            print(
+                textwrap.dedent(
+                    """\
             You need an OpenAI key to use this tool.
             You can get a key here: https://platform.openai.com/api-keys
             Set the environment variable OPENAI_API_KEY to your key value.
-            """))
+            """
+                )
+            )
             sys.exit(-1)
-    
 
         self.assistants = self.client.beta.assistants
         self.threads = self.client.beta.threads
@@ -146,11 +149,11 @@ def run(self, prompt, client_print=print):
         try:
             if self.assistant == None:
                 return {
-                    'tokens' : run.usage.total_tokens,
-                    'prompt_tokens' : run.usage.prompt_tokens,
-                    'completion_tokens' : run.usage.completion_tokens,
-                    'model' : self.assistant.model,
-                    'cost' : cost, 
+                    "tokens": run.usage.total_tokens,
+                    "prompt_tokens": run.usage.prompt_tokens,
+                    "completion_tokens": run.usage.completion_tokens,
+                    "model": self.assistant.model,
+                    "cost": cost,
                 }
 
             assert len(prompt) <= 32768
@@ -224,15 +227,15 @@ def run(self, prompt, client_print=print):
             client_print(f"[Cost: ~${cost:.2f} USD]")
 
             return {
-                'tokens' : run.usage.total_tokens,
-                'prompt_tokens' : run.usage.prompt_tokens,
-                'completion_tokens' : run.usage.completion_tokens,
-                'model' : self.assistant.model,
-                'cost' : cost, 
-                'time' : elapsed_time,
-                'thread.id' : self.thread.id,
-                'run.id': run.id,
-                'assistant.id' : self.assistant.id
+                "tokens": run.usage.total_tokens,
+                "prompt_tokens": run.usage.prompt_tokens,
+                "completion_tokens": run.usage.completion_tokens,
+                "model": self.assistant.model,
+                "cost": cost,
+                "time": elapsed_time,
+                "thread.id": self.thread.id,
+                "run.id": run.id,
+                "assistant.id": self.assistant.id,
             }
         except OpenAIError as e:
             client_print(f"*** OpenAI Error: {e}")
diff --git a/src/chatdbg/chatdbg_pdb.py b/src/chatdbg/chatdbg_pdb.py
index eba4a55..cae7bfe 100644
--- a/src/chatdbg/chatdbg_pdb.py
+++ b/src/chatdbg/chatdbg_pdb.py
@@ -86,7 +86,7 @@ def __init__(self, *args, **kwargs):
         self._assistant = None
         self._history = []
         self._error_specific_prompt = ""
-    
+
         global chatdbg_config
         if chatdbg_config == None:
             chatdbg_config = Chat()
@@ -152,7 +152,9 @@ def interaction(self, frame, tb_or_exc):
             exception = None
 
         if exception != None:
-            details = "".join(traceback.format_exception_only(type(exception), exception)).rstrip()
+            details = "".join(
+                traceback.format_exception_only(type(exception), exception)
+            ).rstrip()
             self._error_specific_prompt = (
                 f"The program encountered the following error:\n```\n{details}\n```\n"
             )
@@ -587,8 +589,6 @@ def do_mark(self, arg):
         else:
             self._log.add_mark(arg)
 
-    
-
     def do_config(self, arg):
         args = arg.split()
         if len(args) == 0:
diff --git a/src/chatdbg/ipdb_util/capture.py b/src/chatdbg/ipdb_util/capture.py
index 02107c2..21c75ba 100644
--- a/src/chatdbg/ipdb_util/capture.py
+++ b/src/chatdbg/ipdb_util/capture.py
@@ -1,8 +1,9 @@
 from io import StringIO, TextIOWrapper
 
+
 class CaptureInput:
     def __init__(self, input_stream):
-        input_stream = TextIOWrapper(input_stream.buffer, encoding='utf-8', newline='')
+        input_stream = TextIOWrapper(input_stream.buffer, encoding="utf-8", newline="")
 
         self.original_input = input_stream
         self.capture_buffer = StringIO()