diff --git a/Week04/decorators_sekip_yaman_arslan.py b/Week04/decorators_sekip_yaman_arslan.py
new file mode 100644
index 00000000..267a4141
--- /dev/null
+++ b/Week04/decorators_sekip_yaman_arslan.py
@@ -0,0 +1,32 @@
+import time
+import tracemalloc as tm
+
+
+def performance(func):
+    """
+    A decorator function that measures the performance of the given function
+    and also saves some statistics.
+    (The definition is from the lecture notes.)
+    """
+    performance.counter = 0
+    performance.total_mem = 0.0
+    performance.total_time = 0.0
+
+    def _performance(*args, **kwargs):
+        tm.start()
+        start_time = time.time()
+
+        result = func(*args, **kwargs)
+
+        _, peak_mem = tm.get_traced_memory()
+        end_time = time.time()
+
+        tm.stop()
+
+        performance.total_time += end_time - start_time
+        performance.total_mem += peak_mem
+        performance.counter += 1
+
+        return result
+
+    return _performance