diff --git a/Week04/decorators_mert_yuksel.py b/Week04/decorators_mert_yuksel.py
new file mode 100644
index 00000000..4c2a6a03
--- /dev/null
+++ b/Week04/decorators_mert_yuksel.py
@@ -0,0 +1,31 @@
+import time
+import tracemalloc as tm
+
+def performance(func):
+    """
+    A decorater function that measures the performance of the given function and also save some statistics
+    (The definition is from lecture notes.pdf)
+    """
+    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()
+        endtime = time.time()
+        
+        tm.stop()
+
+        performance.total_time += endtime - start_time
+        performance.total_mem += peak_mem
+        performance.counter += 1
+        
+        return result
+
+    return _performance
\ No newline at end of file
diff --git a/Week04/functions_mert_yuksel.py b/Week04/functions_mert_yuksel.py
new file mode 100644
index 00000000..2d0eb829
--- /dev/null
+++ b/Week04/functions_mert_yuksel.py
@@ -0,0 +1,27 @@
+custom_power = lambda x=0 , / , e=1 : x **e
+
+def custom_equation(x: int=0, y: int=0, /, a: int=1, b: int=1, *, c: int=1) -> float:
+    """
+    This function does something
+
+    :param x: positional only argument,       defaults to 0
+    :type  x: int 
+    :param y: poisitonal only argument,       defaults to 0
+    :type  y: int
+    :param a: positional or keyword argument, defaults to 1
+    :type  a: int
+    :param b: positional or keyword argument, defaults to 1
+    :type  b: int
+    :param c: keyword only argument,          defaults to 1
+    :type  c: int
+    :return: the result of division by c the sum of x to the power of a and y to the power of b 
+    :rtype : float
+    """
+    return (x**a + y **b) / c
+
+def fn_w_counter() -> (int, dict[str, int]):
+    if not hasattr(fn_w_counter, "count"):
+        fn_w_counter.count = 0
+    
+    fn_w_counter.count += 1
+    return fn_w_counter.count, {__name__: fn_w_counter.count} 
\ No newline at end of file
diff --git a/Week05/awaitme_mert_yuksel.py b/Week05/awaitme_mert_yuksel.py
new file mode 100644
index 00000000..a4774153
--- /dev/null
+++ b/Week05/awaitme_mert_yuksel.py
@@ -0,0 +1,7 @@
+def awaitme(func):
+
+    async def _awaitme(*args, **kwargs):
+        result = func(*args, **kwargs)
+        return result
+    
+    return _awaitme
\ No newline at end of file