df: Remove multiple inheritance from NamedTuple

Python 3.9 does not allow this. Use dataclasses instead.

Fixes: #1052

Signed-off-by: John Andersen <johnandersenpdx@gmail.com>

dffml/df/base.py

@@ -13,7 +13,7 @@
     Optional,
     Set,
 )
-from dataclasses import is_dataclass
+from dataclasses import dataclass, is_dataclass, replace
 from contextlib import asynccontextmanager
 
 from .exceptions import NotOpImp
@@ -988,13 +988,17 @@ class OperationException(Exception):
     """
 
 
-class BaseOrchestratorConfig(BaseConfig, NamedTuple):
+@dataclass(frozen=True)
+class BaseOrchestratorConfig:
     input_network: BaseInputNetwork
     operation_network: BaseOperationNetwork
     lock_network: BaseLockNetwork
     opimp_network: BaseOperationImplementationNetwork
     rchecker: BaseRedundancyChecker
 
+    def _replace(self, **kwargs):
+        return replace(self, **kwargs)
+
 
 class BaseOrchestratorContext(BaseDataFlowObjectContext):
     @abc.abstractmethod

dffml/df/types.py

@@ -3,7 +3,7 @@
 import itertools
 import pkg_resources
 from enum import Enum
-from dataclasses import dataclass, field, asdict
+from dataclasses import dataclass, field, asdict, replace
 from typing import (
     NamedTuple,
     Union,
@@ -167,18 +167,22 @@ class FailedToLoadOperation(Exception):
     """
 
 
+@dataclass(frozen=True)
 @base_entry_point("dffml.operation", "operation")
-class Operation(NamedTuple, Entrypoint):
+class Operation(Entrypoint):
     name: str
-    inputs: Dict[str, Definition] = {}
-    outputs: Dict[str, Definition] = {}
+    inputs: Dict[str, Definition] = field(default_factory=lambda: {})
+    outputs: Dict[str, Definition] = field(default_factory=lambda: {})
     stage: Stage = Stage.PROCESSING
-    conditions: Optional[List[Definition]] = []
-    expand: Optional[List[str]] = []
+    conditions: Optional[List[Definition]] = field(default_factory=lambda: [])
+    expand: Optional[List[str]] = field(default_factory=lambda: [])
     instance_name: Optional[str] = None
     validator: bool = False
     retry: int = 0
 
+    def _replace(self, **kwargs):
+        return replace(self, **kwargs)
+
     def export(self):
         exported = {
             "name": self.name,