check for email-validator version >= 2.0

will use email_validator.__version__ if available
(JoshData/python-email-validator#110)

pydantic/networks.py

@@ -164,6 +164,13 @@ def import_email_validator() -> None:
         import email_validator
     except ImportError as e:
         raise ImportError('email-validator is not installed, run `pip install pydantic[email]`') from e
+    if hasattr(email_validator, "__version__") and email_validator.__version__.partition(".")[0] == "2":
+        return
+    else:
+        input_email = b"testaddr@example.tld"
+        valid_email = validate_email(input_email, check_deliverability=False)
+        if not hasattr(valid_email, "normalized"):
+            raise ImportError('email-validator version >= 2.0 required')
 
 
 if TYPE_CHECKING: