chore(examples): fix static types in assistants example (#852)

examples/assistant.py

@@ -1,6 +1,7 @@
-import openai
 import time
 
+import openai
+
 # gets API Key from environment variable OPENAI_API_KEY
 client = openai.OpenAI()
 
@@ -16,38 +17,31 @@
 message = client.beta.threads.messages.create(
     thread_id=thread.id,
     role="user",
-    content="I need to solve the equation `3x + 11 = 14`. Can you help me?"
+    content="I need to solve the equation `3x + 11 = 14`. Can you help me?",
 )
 
 run = client.beta.threads.runs.create(
-  thread_id=thread.id,
-  assistant_id=assistant.id,
-  instructions="Please address the user as Jane Doe. The user has a premium account."
+    thread_id=thread.id,
+    assistant_id=assistant.id,
+    instructions="Please address the user as Jane Doe. The user has a premium account.",
 )
 
 print("checking assistant status. ")
 while True:
-    run = client.beta.threads.runs.retrieve(
-        thread_id=thread.id,
-        run_id=run.id
-    )
+    run = client.beta.threads.runs.retrieve(thread_id=thread.id, run_id=run.id)
 
     if run.status == "completed":
         print("done!")
-        messages = client.beta.threads.messages.list(
-            thread_id=thread.id
-        )
+        messages = client.beta.threads.messages.list(thread_id=thread.id)
 
         print("messages: ")
         for message in messages:
-            print({
-                "role": message.role,
-                "message": message.content[0].text.value
-            })
+            assert message.content[0].type == "text"
+            print({"role": message.role, "message": message.content[0].text.value})
 
         client.beta.assistants.delete(assistant.id)
-        
+
         break
     else:
         print("in progress...")
-        time.sleep(5)
+        time.sleep(5)