Add Emails class for validating unique email addresses

Week05/emails_aleyna_gultekin.py

@@ -0,0 +1,30 @@
+import re
+
+
+class Emails(list):
+    """A list of unique and valid e-mail addresses."""
+
+    EMAIL_PATTERN = re.compile(r"^[\w.+-]+@[\w-]+(\.[\w-]+)+$")
+
+    def __init__(self, emails):
+        valid_emails = self.validate(emails)
+        super().__init__(valid_emails)
+        self.data = list(self)
+
+    @staticmethod
+    def validate(emails):
+        unique = []
+        for email in emails:
+            if not isinstance(email, str):
+                raise ValueError(f"{email!r} is not a string")
+            if not Emails.EMAIL_PATTERN.match(email):
+                raise ValueError(f"{email!r} is not a valid e-mail address")
+            if email not in unique:
+                unique.append(email)
+        return unique
+
+    def __repr__(self):
+        return f"Emails({list(self)!r})"
+
+    def __str__(self):
+        return ", ".join(self)