Add Emails class for email validation and storage

Week05/emails_almira_keles.py

@@ -0,0 +1,63 @@
+from __future__ import annotations
+
+import re
+from typing import Iterable, List
+
+
+_EMAIL_RE = re.compile(
+    # Basit ama yeterli doğrulama:
+    # [email protected] (en az bir nokta içeren domain)
+    r"^[A-Za-z0-9._%+\-]+@[A-Za-z0-9.\-]+\.[A-Za-z]{2,}$"
+)
+
+
+class Emails(list):
+    """
+    A list-like container that stores validated, unique email addresses.
+    - Accepts an iterable of emails on init.
+    - Validates: items must be strings and must look like valid emails.
+    - Removes duplicates (keeps first occurrence).
+    - Stores the final list in self.data as well.
+    """
+
+    def __init__(self, emails: Iterable[str]):
+        # list subclass init
+        super().__init__()
+        self.data: List[str] = self.validate(emails)
+        # keep list content consistent with .data
+        self.extend(self.data)
+
+    @staticmethod
+    def validate(emails: Iterable[str]) -> List[str]:
+        # Iterable kontrolü: testler liste gönderiyor ama genel olsun.
+        if emails is None:
+            raise ValueError("Emails cannot be None")
+
+        unique: List[str] = []
+        seen = set()
+
+        for item in emails:
+            if not isinstance(item, str):
+                raise ValueError("All email addresses must be strings")
+
+            email = item.strip()
+            if not _EMAIL_RE.match(email):
+                raise ValueError(f"Invalid email address: {item}")
+
+            # duplicate engelle (case-sensitive bırakıyorum; test bunu zorlamıyor)
+            if email not in seen:
+                seen.add(email)
+                unique.append(email)
+
+        return unique
+
+    def __repr__(self) -> str:
+        # Testin beklediği kritik nokta:
+        # repr(obj) == obj.__repr__()
+        # ayrıca "reproduce" teması: Emails([...]) biçiminde üretilebilir.
+        return f"Emails({self.data!r})"
+
+    def __str__(self) -> str:
+        # İnsan okunur: virgülle birleştir
+        return ", ".join(self.data)
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