Update Python code formatting, configuration loading, and local model additions

1. Code Formatting:
   - Standardized Python code formatting across multiple files to align with PEP 8 guidelines. This includes adjustments to whitespace, line breaks, and inline comments.

2. Configuration Loader Enhancements:
   - Enhanced the `get_settings` function in `config_loader.py` to provide more robust handling of settings retrieval. Added detailed documentation to improve code maintainability and clarity.

3. Model Addition in __init__.py:
   - Added a new model "ollama/llama3" with a token limit to the MAX_TOKENS dictionary in `__init__.py` to support new AI capabilities and configurations.

pr_agent/algo/ai_handlers/base_ai_handler.py

@@ -1,5 +1,6 @@
 from abc import ABC, abstractmethod
 
+
 class BaseAiHandler(ABC):
     """
     This class defines the interface for an AI handler to be used by the PR Agents.  
@@ -14,7 +15,7 @@ class BaseAiHandler(ABC):
     def deployment_id(self):
         pass
 
-    @abstractmethod   
+    @abstractmethod
     async def chat_completion(self, model: str, system: str, user: str, temperature: float = 0.2, img_path: str = None):
         """
         This method should be implemented to return a chat completion from the AI model.
@@ -25,4 +26,3 @@ class BaseAiHandler(ABC):
             temperature (float): the temperature to use for the chat completion    
         """
         pass
-

pr_agent/algo/ai_handlers/langchain_ai_handler.py

@@ -1,7 +1,7 @@
 try:
     from langchain.chat_models import ChatOpenAI, AzureChatOpenAI
     from langchain.schema import SystemMessage, HumanMessage
-except: # we don't enforce langchain as a dependency, so if it's not installed, just move on
+except:  # we don't enforce langchain as a dependency, so if it's not installed, just move on
     pass
 
 from pr_agent.algo.ai_handlers.base_ai_handler import BaseAiHandler
@@ -14,6 +14,7 @@ import functools
 
 OPENAI_RETRIES = 5
 
+
 class LangChainOpenAIHandler(BaseAiHandler):
     def __init__(self):
         # Initialize OpenAIHandler specific attributes here
@@ -36,7 +37,7 @@ class LangChainOpenAIHandler(BaseAiHandler):
                 raise ValueError(f"OpenAI {e.name} is required") from e
             else:
                 raise e
-    
+
     @property
     def chat(self):
         if self.azure:
@@ -51,17 +52,18 @@ class LangChainOpenAIHandler(BaseAiHandler):
         Returns the deployment ID for the OpenAI API.
         """
         return get_settings().get("OPENAI.DEPLOYMENT_ID", None)
+
     @retry(exceptions=(APIError, Timeout, TryAgain, AttributeError, RateLimitError),
            tries=OPENAI_RETRIES, delay=2, backoff=2, jitter=(1, 3))
     async def chat_completion(self, model: str, system: str, user: str, temperature: float = 0.2):
         try:
-            messages=[SystemMessage(content=system), HumanMessage(content=user)]
-            
+            messages = [SystemMessage(content=system), HumanMessage(content=user)]
+
             # get a chat completion from the formatted messages
             resp = self.chat(messages, model=model, temperature=temperature)
-            finish_reason="completed"
+            finish_reason = "completed"
             return resp.content, finish_reason
-        
+
         except (Exception) as e:
             get_logger().error("Unknown error during OpenAI inference: ", e)
-            raise e
+            raise e

pr_agent/algo/ai_handlers/litellm_ai_handler.py

@@ -61,7 +61,7 @@ class LiteLLMAIHandler(BaseAiHandler):
         if get_settings().get("HUGGINGFACE.API_BASE", None) and 'huggingface' in get_settings().config.model:
             litellm.api_base = get_settings().huggingface.api_base
             self.api_base = get_settings().huggingface.api_base
-        if get_settings().get("OLLAMA.API_BASE", None) :
+        if get_settings().get("OLLAMA.API_BASE", None):
             litellm.api_base = get_settings().ollama.api_base
             self.api_base = get_settings().ollama.api_base
         if get_settings().get("HUGGINGFACE.REPITITION_PENALTY", None):
@@ -129,7 +129,7 @@ class LiteLLMAIHandler(BaseAiHandler):
                 "messages": messages,
                 "temperature": temperature,
                 "force_timeout": get_settings().config.ai_timeout,
-                "api_base" : self.api_base,
+                "api_base": self.api_base,
             }
             if self.aws_bedrock_client:
                 kwargs["aws_bedrock_client"] = self.aws_bedrock_client

pr_agent/algo/ai_handlers/openai_ai_handler.py

@@ -28,13 +28,14 @@ class OpenAIHandler(BaseAiHandler):
 
         except AttributeError as e:
             raise ValueError("OpenAI key is required") from e
+
     @property
     def deployment_id(self):
         """
         Returns the deployment ID for the OpenAI API.
         """
         return get_settings().get("OPENAI.DEPLOYMENT_ID", None)
-    
+
     @retry(exceptions=(APIError, Timeout, TryAgain, AttributeError, RateLimitError),
            tries=OPENAI_RETRIES, delay=2, backoff=2, jitter=(1, 3))
     async def chat_completion(self, model: str, system: str, user: str, temperature: float = 0.2):
@@ -54,8 +55,8 @@ class OpenAIHandler(BaseAiHandler):
             finish_reason = chat_completion["choices"][0]["finish_reason"]
             usage = chat_completion.get("usage")
             get_logger().info("AI response", response=resp, messages=messages, finish_reason=finish_reason,
-                            model=model, usage=usage)
-            return resp, finish_reason       
+                              model=model, usage=usage)
+            return resp, finish_reason
         except (APIError, Timeout, TryAgain) as e:
             get_logger().error("Error during OpenAI inference: ", e)
             raise
@@ -64,4 +65,4 @@ class OpenAIHandler(BaseAiHandler):
             raise
         except (Exception) as e:
             get_logger().error("Unknown error during OpenAI inference: ", e)
-            raise TryAgain from e        
+            raise TryAgain from e