Add __all__ (#13704)

stubs/mysqlclient/MySQLdb/__init__.pyi

@@ -49,3 +49,47 @@ def Binary(x): ...
 def Connect(*args, **kwargs) -> Connection: ...
 
 connect = Connect
+
+__all__ = [
+    "BINARY",
+    "Binary",
+    "Connect",
+    "Connection",
+    "DATE",
+    "Date",
+    "Time",
+    "Timestamp",
+    "DateFromTicks",
+    "TimeFromTicks",
+    "TimestampFromTicks",
+    "DataError",
+    "DatabaseError",
+    "Error",
+    "FIELD_TYPE",
+    "IntegrityError",
+    "InterfaceError",
+    "InternalError",
+    "MySQLError",
+    "NUMBER",
+    "NotSupportedError",
+    "DBAPISet",
+    "OperationalError",
+    "ProgrammingError",
+    "ROWID",
+    "STRING",
+    "TIME",
+    "TIMESTAMP",
+    "Warning",
+    "apilevel",
+    "connect",
+    "connections",
+    "constants",
+    "converters",
+    "cursors",
+    "debug",
+    "get_client_info",
+    "paramstyle",
+    "string_literal",
+    "threadsafety",
+    "version_info",
+]

stubs/mysqlclient/MySQLdb/constants/__init__.pyi

@@ -1 +1,3 @@
 from . import CLIENT as CLIENT, CR as CR, ER as ER, FIELD_TYPE as FIELD_TYPE, FLAG as FLAG
+
+__all__ = ["CR", "FIELD_TYPE", "CLIENT", "ER", "FLAG"]