Refine email validation and enforce uniqueness

Updated email validation to ensure exactly one '@' and added unique email handling.

Author: kerimcandede

Week05/emails_kerimcan_dede.py

@@ -4,12 +4,10 @@ def validate(self):
         for email in self:
             if not isinstance(email, str):
                 raise ValueError("Emails must be string.")
-            if "@" not in email:
-                raise ValueError("Emails must contain @.")
+            if email.count("@") != 1:
+                raise ValueError("Emails must contain one @.")
             if "." not in email.split("@")[1]:
                 raise ValueError("Emails must contain a dot after @.")
-        if len(self) != len(set(self)):
-            raise ValueError("Duplicate emails are not allowed.")
         else:
             print("Validation is successfull.")
 
@@ -21,8 +19,16 @@ def __init__(self, iterable=None):
         except ValueError as error:
             print(error)
 
+        unique_emails = list(dict.fromkeys(self))
+        super().clear()
+        super().extend(unique_emails)
+
     def __repr__(self):
         return f"Email list : ({super().__repr__()})"
 
     def __str__(self):
         return f"Email list : {list(self)}"
+
+    @property
+    def data(self):
+        return self