Add missing docstrings and pylint improvements (#130)

server.py

@@ -16,7 +16,7 @@ from src.engines.engine_manager import EngineManager
 from src.render_queue import RenderQueue
 from src.utilities.config import Config
 from src.utilities.misc_helper import (get_gpu_info, current_system_cpu, current_system_os,
-                                       current_system_os_version, current_system_cpu_brand, check_for_updates)
+                                       current_system_os_version, current_system_cpu_brand)
 from src.utilities.zeroconf_server import ZeroconfServer
 from src.version import APP_NAME, APP_VERSION
 
@@ -38,17 +38,16 @@ class ZordonServer:
         Config.load_config(config_path)
 
         # configure default paths
-        EngineManager.engines_path = Path(Config.upload_folder).expanduser()/ "engines"
+        EngineManager.engines_path = str(Path(Config.upload_folder).expanduser()/ "engines")
         os.makedirs(EngineManager.engines_path, exist_ok=True)
         PreviewManager.storage_path = Path(Config.upload_folder).expanduser() / "previews"
 
         self.api_server = None
-        self.server_hostname = None
+        self.server_hostname: str = socket.gethostname()
 
     def start_server(self):
 
         def existing_process(process_name):
-            import psutil
             current_pid = os.getpid()
             current_process = psutil.Process(current_pid)
             for proc in psutil.process_iter(['pid', 'name', 'ppid']):
@@ -79,7 +78,7 @@ class ZordonServer:
         ServerProxyManager.subscribe_to_listener()
         DistributedJobManager.subscribe_to_listener()
 
-        # get hostname
+        # update hostname
         self.server_hostname = socket.gethostname()
 
         # configure and start API server