codegen, handwritten: Use tuple for empty __slots__

Work around python/mypy#10870 - Mypy complains
when [] is used for __slots__ definition

generated\nidaqmx\_base_interpreter.py:8: error: Need type annotation for "__slots__" (hint: "__slots__: List[<type>] = ...")  [var-annotated]

Signed-off-by: Brad Keryan <brad.keryan@ni.com>

generated/nidaqmx/_base_interpreter.py

@@ -5,7 +5,7 @@
 
 class BaseEventHandler(abc.ABC):
     """Interpreter-specific object that is returned from register_*_event()."""
-    __slots__ = []
+    __slots__ = ()
 
     @abc.abstractmethod
     def close(self) -> None:
@@ -21,7 +21,7 @@ class BaseInterpreter(abc.ABC):
     """
     Contains signature of functions for all DAQmx APIs.
     """
-    __slots__ = []
+    __slots__ = ()
 
     @abc.abstractmethod
     def add_cdaq_sync_connection(self, port_list):

generated/nidaqmx/_library_interpreter.py

@@ -38,7 +38,7 @@ class LibraryInterpreter(BaseInterpreter):
 
     """
     # Do not add per-task state to the interpreter class.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self):
         pass

generated/nidaqmx/_task_modules/channels/ai_channel.py

@@ -32,7 +32,7 @@ class AIChannel(Channel):
     """
     Represents one or more analog input virtual channels and their properties.
     """
-    __slots__ = []
+    __slots__ = ()
 
     def __repr__(self):
         return f'AIChannel(name={self._name})'

generated/nidaqmx/_task_modules/channels/ao_channel.py

@@ -13,7 +13,7 @@ class AOChannel(Channel):
     """
     Represents one or more analog output virtual channels and their properties.
     """
-    __slots__ = []
+    __slots__ = ()
 
     def __repr__(self):
         return f'AOChannel(name={self._name})'

generated/nidaqmx/_task_modules/channels/ci_channel.py

@@ -15,7 +15,7 @@ class CIChannel(Channel):
     """
     Represents one or more counter input virtual channels and their properties.
     """
-    __slots__ = []
+    __slots__ = ()
 
     def __repr__(self):
         return f'CIChannel(name={self._name})'

generated/nidaqmx/_task_modules/channels/co_channel.py

@@ -10,7 +10,7 @@ class COChannel(Channel):
     """
     Represents one or more counter output virtual channels and their properties.
     """
-    __slots__ = []
+    __slots__ = ()
 
     def __repr__(self):
         return f'COChannel(name={self._name})'

generated/nidaqmx/_task_modules/channels/di_channel.py

@@ -10,7 +10,7 @@ class DIChannel(Channel):
     """
     Represents one or more digital input virtual channels and their properties.
     """
-    __slots__ = []
+    __slots__ = ()
 
     def __repr__(self):
         return f'DIChannel(name={self._name})'

generated/nidaqmx/_task_modules/channels/do_channel.py

@@ -10,7 +10,7 @@ class DOChannel(Channel):
     """
     Represents one or more digital output virtual channels and their properties.
     """
-    __slots__ = []
+    __slots__ = ()
 
     def __repr__(self):
         return f'DOChannel(name={self._name})'

generated/nidaqmx/scale.py

@@ -531,7 +531,7 @@ class _ScaleAlternateConstructor(Scale):
     This is a private API used to instantiate a Scale with an existing interpreter.
     """
     # Setting __slots__ avoids TypeError: __class__ assignment: 'Base' object layout differs from 'Derived'.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self, name, interpreter):
         """

generated/nidaqmx/system/device.py

@@ -1157,7 +1157,7 @@ class _DeviceAlternateConstructor(Device):
     This is a private API used to instantiate a Device with an existing interpreter.
     """
     # Setting __slots__ avoids TypeError: __class__ assignment: 'Base' object layout differs from 'Derived'.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self, name, interpreter):
         """

generated/nidaqmx/system/physical_channel.py

@@ -679,7 +679,7 @@ class _PhysicalChannelAlternateConstructor(PhysicalChannel):
     This is a private API used to instantiate a PhysicalChannel with an existing interpreter.
     """
     # Setting __slots__ avoids TypeError: __class__ assignment: 'Base' object layout differs from 'Derived'.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self, name, interpreter):
         """

generated/nidaqmx/system/storage/persisted_channel.py

@@ -87,7 +87,7 @@ class _PersistedChannelAlternateConstructor(PersistedChannel):
     This is a private API used to instantiate a PersistedChannel with an existing interpreter.
     """
     # Setting __slots__ avoids TypeError: __class__ assignment: 'Base' object layout differs from 'Derived'.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self, name, interpreter):
         """

generated/nidaqmx/system/storage/persisted_scale.py

@@ -97,7 +97,7 @@ class _PersistedScaleAlternateConstructor(PersistedScale):
     This is a private API used to instantiate a PersistedScale with an existing interpreter.
     """
     # Setting __slots__ avoids TypeError: __class__ assignment: 'Base' object layout differs from 'Derived'.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self, name, interpreter):
         """

generated/nidaqmx/system/storage/persisted_task.py

@@ -101,7 +101,7 @@ class _PersistedTaskAlternateConstructor(PersistedTask):
     This is a private API used to instantiate a PersistedTask with an existing interpreter.
     """
     # Setting __slots__ avoids TypeError: __class__ assignment: 'Base' object layout differs from 'Derived'.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self, name, interpreter):
         """

generated/nidaqmx/task.py

@@ -1179,7 +1179,7 @@ class _TaskAlternateConstructor(Task):
     This is a private API used to instantiate a Task with an existing task handle and interpreter.
     """
     # Setting __slots__ avoids TypeError: __class__ assignment: 'Base' object layout differs from 'Derived'.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self, task_handle, interpreter, close_on_exit):
         """

src/codegen/templates/_base_interpreter.py.mako

@@ -15,7 +15,7 @@ from typing import Optional
 
 class BaseEventHandler(abc.ABC):
     """Interpreter-specific object that is returned from register_*_event()."""
-    __slots__ = []
+    __slots__ = ()
 
     @abc.abstractmethod
     def close(self) -> None:
@@ -31,7 +31,7 @@ class BaseInterpreter(abc.ABC):
     """
     Contains signature of functions for all DAQmx APIs.
     """
-    __slots__ = []
+    __slots__ = ()
 
 % for func in functions:
 <%

src/codegen/templates/_library_interpreter.py.mako

@@ -54,7 +54,7 @@ class LibraryInterpreter(BaseInterpreter):
 
     """
     # Do not add per-task state to the interpreter class.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self):
         pass

src/codegen/templates/_task_modules/channels/ai_channel.py.mako

@@ -20,7 +20,7 @@ class AIChannel(Channel):
     """
     Represents one or more analog input virtual channels and their properties.
     """
-    __slots__ = []
+    __slots__ = ()
 
     def __repr__(self):
         return f'AIChannel(name={self._name})'

src/codegen/templates/_task_modules/channels/ao_channel.py.mako

@@ -16,7 +16,7 @@ class AOChannel(Channel):
     """
     Represents one or more analog output virtual channels and their properties.
     """
-    __slots__ = []
+    __slots__ = ()
 
     def __repr__(self):
         return f'AOChannel(name={self._name})'

src/codegen/templates/_task_modules/channels/ci_channel.py.mako

@@ -16,7 +16,7 @@ class CIChannel(Channel):
     """
     Represents one or more counter input virtual channels and their properties.
     """
-    __slots__ = []
+    __slots__ = ()
 
     def __repr__(self):
         return f'CIChannel(name={self._name})'

src/codegen/templates/_task_modules/channels/co_channel.py.mako

@@ -15,7 +15,7 @@ class COChannel(Channel):
     """
     Represents one or more counter output virtual channels and their properties.
     """
-    __slots__ = []
+    __slots__ = ()
 
     def __repr__(self):
         return f'COChannel(name={self._name})'

src/codegen/templates/_task_modules/channels/di_channel.py.mako

@@ -15,7 +15,7 @@ class DIChannel(Channel):
     """
     Represents one or more digital input virtual channels and their properties.
     """
-    __slots__ = []
+    __slots__ = ()
 
     def __repr__(self):
         return f'DIChannel(name={self._name})'

src/codegen/templates/_task_modules/channels/do_channel.py.mako

@@ -15,7 +15,7 @@ class DOChannel(Channel):
     """
     Represents one or more digital output virtual channels and their properties.
     """
-    __slots__ = []
+    __slots__ = ()
 
     def __repr__(self):
         return f'DOChannel(name={self._name})'

src/codegen/templates/scale.py.mako

@@ -336,7 +336,7 @@ class _ScaleAlternateConstructor(Scale):
     This is a private API used to instantiate a Scale with an existing interpreter.
     """
     # Setting __slots__ avoids TypeError: __class__ assignment: 'Base' object layout differs from 'Derived'.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self, name, interpreter):
         """

src/codegen/templates/system/device.py.mako

@@ -230,7 +230,7 @@ class _DeviceAlternateConstructor(Device):
     This is a private API used to instantiate a Device with an existing interpreter.
     """
     # Setting __slots__ avoids TypeError: __class__ assignment: 'Base' object layout differs from 'Derived'.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self, name, interpreter):
         """

src/codegen/templates/system/physical_channel.py.mako

@@ -80,7 +80,7 @@ class _PhysicalChannelAlternateConstructor(PhysicalChannel):
     This is a private API used to instantiate a PhysicalChannel with an existing interpreter.
     """
     # Setting __slots__ avoids TypeError: __class__ assignment: 'Base' object layout differs from 'Derived'.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self, name, interpreter):
         """

src/handwritten/system/storage/persisted_channel.py

@@ -87,7 +87,7 @@ class _PersistedChannelAlternateConstructor(PersistedChannel):
     This is a private API used to instantiate a PersistedChannel with an existing interpreter.
     """
     # Setting __slots__ avoids TypeError: __class__ assignment: 'Base' object layout differs from 'Derived'.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self, name, interpreter):
         """

src/handwritten/system/storage/persisted_scale.py

@@ -97,7 +97,7 @@ class _PersistedScaleAlternateConstructor(PersistedScale):
     This is a private API used to instantiate a PersistedScale with an existing interpreter.
     """
     # Setting __slots__ avoids TypeError: __class__ assignment: 'Base' object layout differs from 'Derived'.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self, name, interpreter):
         """

src/handwritten/system/storage/persisted_task.py

@@ -101,7 +101,7 @@ class _PersistedTaskAlternateConstructor(PersistedTask):
     This is a private API used to instantiate a PersistedTask with an existing interpreter.
     """
     # Setting __slots__ avoids TypeError: __class__ assignment: 'Base' object layout differs from 'Derived'.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self, name, interpreter):
         """

src/handwritten/task.py

@@ -1179,7 +1179,7 @@ class _TaskAlternateConstructor(Task):
     This is a private API used to instantiate a Task with an existing task handle and interpreter.
     """
     # Setting __slots__ avoids TypeError: __class__ assignment: 'Base' object layout differs from 'Derived'.
-    __slots__ = []
+    __slots__ = ()
 
     def __init__(self, task_handle, interpreter, close_on_exit):
         """