separated clients handlers, cart->checkout ppline

misc/utils.py

@@ -0,0 +1,10 @@
+import phonenumbers
+from phonenumbers import NumberParseException
+
+
+def is_valid_phone(phone: str, region="RU") -> bool:
+    try:
+        parsed = phonenumbers.parse(phone, region)
+        return phonenumbers.is_valid_number(parsed)
+    except NumberParseException:
+        return False