Refactor DifyClient to fix initialization and recursion issues

- Modify __init__ method to properly set api_key and base_url
- Remove dependency on __getattr__ during initialization
- Ensure sdk is created after api_key and base_url are set
- Maintain backwards compatibility with config file loading
- Improve error handling for missing API key
- Retain conversation management functionality

setup.py

@@ -2,7 +2,7 @@
 
 setup(
     name="dify-api-python",
-    version="0.1.4",
+    version="0.1.5",
     author="zlz3907",
     author_email="zlz3907@gmail.com",
     description="A Python client for the Dify API",

src/dify_api_python/client.py

@@ -7,11 +7,13 @@ class DifyClient:
     def __init__(self, api_key=None, base_url=None, config_path=None):
         if config_path or (not api_key and not base_url):
             self._load_config(config_path)
+        else:
+            self.api_key = api_key
+            self.base_url = base_url or 'https://api.dify.ai/v1'
 
-        if not hasattr(self, 'api_key') or not self.api_key:
+        if not self.api_key:
             raise ValueError("API_KEY is not set. Please provide it as a parameter or in the configuration file.")
 
-        self.base_url = base_url or getattr(self, 'base_url', 'https://api.dify.ai/v1')
         self.sdk = DifySDK(self.api_key, self.base_url)
         self.user_conversations = {}