diff --git a/Week04/functions_Helin_Harman.py b/Week04/functions_Helin_Harman.py
new file mode 100644
index 00000000..14fc51b6
--- /dev/null
+++ b/Week04/functions_Helin_Harman.py
@@ -0,0 +1,116 @@
+
+custom_power = lambda x, /, e=1: x**e  
+
+result = custom_power(3)
+print(result)
+
+def custom_equation(x=0, y=0, /, a=1, *, b=1, c=1) -> float:
+    """
+    This function calculates
+    (x*a + y*b)/c
+    """
+    return (x*a + y*b)/c
+
+result1 = custom_equation(3, 4, 5, b=4, c=2)
+print(result1)
+
+import inspect
+
+global_counter = 0
+caller_log = {}
+
+def fn_w_counter (c: int, d: dict) -> tuple[int, dict]:
+    global global_counter
+    global caller_log
+    
+    # Güvenli çağırıcı tespiti
+    caller_name = 'unknown_run' 
+    try:
+        # inspect.stack()[1] normalde '__main__' veya 'fonksiyon_adı'nı bulur.
+        caller_name = inspect.stack()[1].f_globals.get('__name__', 'system_call')
+    except (IndexError, AttributeError, ValueError):
+        caller_name = 'ide_console' # Hata durumunda bunu logla
+        
+    global_counter += 1
+    caller_log[caller_name] = caller_log.get(caller_name, 0) + 1
+    
+    return (global_counter, caller_log.copy())
+
+def helper_test(val):
+    return fn_w_counter(val, {})
+
+if __name__ == '__main__':
+    print("--- fn_w_counter Gelişmiş Testi ---")
+
+    fn_w_counter(1, {}) 
+
+    count2, log2 = fn_w_counter(2, {})
+    print(f"1. Aşamadan Toplam: {count2}, Log: {log2}")
+
+    count3, log3 = helper_test(3)
+    print(f"2. Aşamadan Toplam: {count3}, Log: {log3}")
+    
+
+import time
+import tracemalloc
+from functools import wraps
+
+def performance(func):
+    @wraps(func) #docstringi korur
+    def _performance(*args, **kwargs):
+        
+        tracemalloc.start()
+        t1 = time.perf_counter()
+        
+        result = func(*args, **kwargs)
+        
+        current, peak = tracemalloc.get_traced_memory() 
+        tracemalloc.stop()
+        t2 = time.perf_counter()
+        
+        elapsed_time = t2 - t1
+        
+        _performance.counter += 1
+        _performance.total_time += elapsed_time
+        _performance.total_mem += peak
+        
+        return result
+    
+    _performance.counter = 0
+    _performance.total_time = 0.0
+    _performance.total_mem = 0
+
+    return _performance
+
+@performance
+def calculate_process_time(n):
+    data = list(range(n))
+    result = sum(data)
+    return result
+
+print("Performance dekoratif testi")
+
+resulta =calculate_process_time(500000)
+print(resulta)
+
+calculate_process_time(1000000)
+
+print(" ")
+
+print("sonuçlar : ")
+
+print(f"Toplam Çağrı Sayısı (counter): {calculate_process_time.counter}")
+print(f"Toplam Süre (total_time): {calculate_process_time.total_time:.4f} saniye")
+print(f"Toplam Bellek (total_mem): {calculate_process_time.total_mem} byte")
+
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