Add Emails class for email validation and representation

Author: sinemtanriver

Week05/emails_sinem_tanriver.py

@@ -0,0 +1,30 @@
+class Emails(list):
+    def __init__(self, email_list):
+        checked = self.validate(email_list)
+        super().__init__(checked)
+        self.data = checked
+
+    def validate(self, email_list):
+        result = []
+        for item in email_list:
+            if type(item) is not str:
+                raise ValueError("Only strings are allowed")
+            if item.count("@") != 1:
+                raise ValueError("Invalid email: " + item)
+            user, domain = item.split("@")
+            if user == "" or "." not in domain:
+                raise ValueError("Invalid email: " + item)
+            if domain.startswith(".") or domain.endswith("."):
+                raise ValueError("Invalid email: " + item)
+            if item not in result:
+                result.append(item)
+        return result
+
+    def __repr__(self):
+        return "Emails(" + str(list(self)) + ")"
+
+    def __str__(self):
+        text = "Emails:\n"
+        for i, mail in enumerate(self, start=1):
+            text += f"{i}. {mail}\n"
+        return text