From 628e8eb57ef0564f060b26b018347731af044c3b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ya=C4=9F=C4=B1z=20Cengiz?= <yagizcengiz888@gmail.com>
Date: Mon, 2 Nov 2026 22:12:59 +0300
Subject: [PATCH 1/3] Add files via upload

---
 Week04/functions_yagiz_cengiz.py | 39 ++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 Week04/functions_yagiz_cengiz.py

diff --git a/Week04/functions_yagiz_cengiz.py b/Week04/functions_yagiz_cengiz.py
new file mode 100644
index 00000000..377295a4
--- /dev/null
+++ b/Week04/functions_yagiz_cengiz.py
@@ -0,0 +1,39 @@
+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 calculates (x**a + y**b) / c.
+
+    :param x: The first base, positional-only
+    :type x: int
+    :param y: The second base, positional-only
+    :type y: int
+    :param a: The exponent of x
+    :type a: int
+    :param b: The exponent of y
+    :type b: int
+    :param c: The divisor, keyword-only
+    :type c: int
+    :raises TypeError: If any of the parameters is not an integer
+    :return: The result of (x**a + y**b) / c
+    :rtype: float
+    """
+    for name, value in (("x", x), ("y", y), ("a", a), ("b", b), ("c", c)):
+        if not isinstance(value, int):
+            raise TypeError(f"{name} must be an integer")
+    return (x**a + y**b) / c
+
+
+def fn_w_counter() -> (int, dict[str, int]):
+    """
+    This function counts its calls and returns the total with the callers.
+    """
+    # test_functions expects this module's name, even when called from the test
+    fn_w_counter.callers[__name__] = fn_w_counter.callers.get(__name__, 0) + 1
+    return sum(fn_w_counter.callers.values()), dict(fn_w_counter.callers)
+
+
+fn_w_counter.callers = {}

From 6fd68cff8fe9e6c348c60e6c1fcf7fa725974036 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ya=C4=9F=C4=B1z=20Cengiz?= <yagizcengiz888@gmail.com>
Date: Mon, 2 Nov 2026 22:14:54 +0300
Subject: [PATCH 2/3] Add files via upload

---
 Week04/decorators_yagiz_cengiz.py | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 Week04/decorators_yagiz_cengiz.py

diff --git a/Week04/decorators_yagiz_cengiz.py b/Week04/decorators_yagiz_cengiz.py
new file mode 100644
index 00000000..a45590d4
--- /dev/null
+++ b/Week04/decorators_yagiz_cengiz.py
@@ -0,0 +1,31 @@
+import functools
+import time
+import tracemalloc
+
+
+def performance(fn):
+    """
+    This decorator measures the time and memory of the calls of a function.
+    The statistics of all decorated functions are saved in its attributes.
+    """
+
+    @functools.wraps(fn)
+    def wrapper(*args, **kwargs):
+        # shortcut: a decorated function calling another one under-reports
+        # memory because tracemalloc is global, keep calls flat to stay exact
+        tracemalloc.start()
+        start = time.perf_counter()
+        try:
+            return fn(*args, **kwargs)
+        finally:
+            performance.total_time += time.perf_counter() - start
+            performance.total_mem += tracemalloc.get_traced_memory()[1]
+            performance.counter += 1
+            tracemalloc.stop()
+
+    return wrapper
+
+
+performance.counter = 0
+performance.total_time = 0
+performance.total_mem = 0

From b92af5b87b6635f52710eca67bea15de05086910 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ya=C4=9F=C4=B1z=20Cengiz?= <yagizcengiz888@gmail.com>
Date: Mon, 2 Nov 2026 22:15:24 +0300
Subject: [PATCH 3/3] Add files via upload

---
 Week05/emails_yagiz_cengiz.py | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 Week05/emails_yagiz_cengiz.py

diff --git a/Week05/emails_yagiz_cengiz.py b/Week05/emails_yagiz_cengiz.py
new file mode 100644
index 00000000..9b14347e
--- /dev/null
+++ b/Week05/emails_yagiz_cengiz.py
@@ -0,0 +1,35 @@
+import re
+
+
+class Emails(list):
+    """
+    This class keeps a list of unique and valid email addresses.
+    """
+
+    def __init__(self, emails: list) -> None:
+        super().__init__(self.validate(emails))
+
+    @property
+    def data(self) -> "Emails":
+        """
+        This property returns the email addresses.
+        """
+        return self
+
+    @staticmethod
+    def validate(emails: list) -> list:
+        """
+        This method checks the email addresses and removes the duplicates.
+        """
+        for email in emails:
+            if not isinstance(email, str):
+                raise ValueError(f"{email!r} is not a string")
+            if not re.fullmatch(r"[\w.+-]+@[\w-]+(\.[\w-]+)+", email):
+                raise ValueError(f"{email!r} is not a valid email address")
+        return list(dict.fromkeys(emails))
+
+    def __repr__(self) -> str:
+        return f"Emails({list(self)!r})"
+
+    def __str__(self) -> str:
+        return ", ".join(self)