diff --git a/Week04/decorators_Helin_Harman.py b/Week04/decorators_Helin_Harman.py
new file mode 100644
index 00000000..3417681d
--- /dev/null
+++ b/Week04/decorators_Helin_Harman.py
@@ -0,0 +1,50 @@
+import time
+import functools
+import tracemalloc
+
+def performance(func):
+    """
+    Fonksiyon performansını ölçen ve istatistikleri (sayaç, süre, bellek) 
+    kendi özniteliklerinde saklayan bir dekoratör.
+    """
+    @functools.wraps(func)
+    def wrapper(*args, **kwargs):
+
+        wrapper.counter += 1
+        
+
+        tracemalloc.start()
+        start_time = time.perf_counter()
+        
+        try:
+            result = func(*args, **kwargs)
+            return result
+        finally:
+
+            end_time = time.perf_counter()
+            duration = end_time - start_time
+            wrapper.total_time += duration
+            
+
+            _, peak = tracemalloc.get_traced_memory()
+            wrapper.total_mem += peak
+            tracemalloc.stop()
+          
+    wrapper.counter = 0
+    wrapper.total_time = 0.0
+    wrapper.total_mem = 0
+    
+    return wrapper
+
+@performance
+def test_function(n):
+
+    return [i**2 for i in range(n)]
+
+if __name__ == "__main__":
+    test_function(100000)
+    test_function(200000)
+
+    print(f"Fonksiyon {test_function.counter} kez çağrıldı.")
+    print(f"Toplam süre: {test_function.total_time:.4f} saniye")
+    print(f"Toplam bellek tüketimi: {test_function.total_mem} byte")