fully implemented project

app/logger.py

@@ -0,0 +1,18 @@
+import sys
+import threading
+
+_console_lock = threading.Lock()
+
+def _log(prefix: str, message: str):
+    with _console_lock:
+        print(prefix + ": " + message)
+
+def info(message: str):
+    _log("INFO", message)
+
+def warning(message: str):
+    _log("WARNING", message)
+
+def error(message: str):
+    _log("ERROR", message)
+    sys.exit(1)