diff --git a/Week04/decorators_veli_unusdu.py b/Week04/decorators_veli_unusdu.py
new file mode 100644
index 00000000..3fd85c5b
--- /dev/null
+++ b/Week04/decorators_veli_unusdu.py
@@ -0,0 +1,23 @@
+import time, tracemalloc
+from functools import wraps
+
+def performance(func):
+    performance.c = performance.c + 1 if hasattr(performance, "c") else 1
+    performance.t = getattr(performance, "t", 0.0)
+    performance.m = getattr(performance, "m", 0)
+
+    @wraps(func)
+    def wrapper(*a, **k):
+        performance.c += 1
+        t0 = time.perf_counter()
+        tracemalloc.start()
+        r = func(*a, **k)
+        performance.t += time.perf_counter() - t0
+        performance.m += tracemalloc.get_traced_memory()[1]
+        tracemalloc.stop()
+        return r
+    return wrapper
+
+performance.counter = 0
+performance.total_time = 0.0
+performance.total_mem = 0
diff --git a/Week04/test_decorators.py b/Week04/test_decorators.py
deleted file mode 100644
index 2f89b9fb..00000000
--- a/Week04/test_decorators.py
+++ /dev/null
@@ -1,44 +0,0 @@
-import os
-import inspect
-import time
-import random
-
-
-files = [f for f in os.listdir(os.path.dirname(__file__)) if f.startswith("decorators")]
-for f in files:
-    exec("import " + f[:-3] + " as " + f[:-3])
-
-
-def test_names():
-    for f in files:
-        assert "performance" in dir(eval(f[:-3])), "timer is not defined in " + f[:-3]
-
-def test_callables():
-    for f in files:
-        assert callable(eval(f[:-3]).performance), "timer is not callable in " + f[:-3]
-
-def test_performance():
-    for f in files:
-        @eval(f[:-3]).performance
-        def dummy_timer(x):
-            time.sleep(x)
-        @eval(f[:-3]).performance
-        def dummy_memory(x):
-            return [random.randint(0, 100) for _ in range(x)]
-        dummy_timer(1)
-        assert eval(f[:-3]).performance.counter == 1, \
-            "performance is not working in " + f[:-3] + " (counter)"
-        assert eval(f[:-3]).performance.total_time > 1, \
-            "performance is not working in " + f[:-3] + " (total_time)"
-        dummy_timer(1)
-        dummy_timer(2)
-        dummy_timer(3)
-        assert eval(f[:-3]).performance.counter == 4, \
-            "performance is not working in " + f[:-3] + " (counter)"
-        assert eval(f[:-3]).performance.total_time > 7, \
-            "performance is not working in " + f[:-3] + " (total_time)"
-        dummy_memory(1000000)
-        assert eval(f[:-3]).performance.counter == 5, \
-            "performance is not working in " + f[:-3] + " (counter)"
-        assert eval(f[:-3]).performance.total_mem > 8.e6, \
-            "performance is not working in " + f[:-3] + " (total_mem)"