types.py: Derive enumerations from standard library classeschandan/enums

`types.py` defines a few enumerations, but only some of them are
derived from the standard `enum.Enum` class.

Among other things, this makes type checking difficult as the inferred
type of the values is `<class 'int'>` or `<class 'str'>`, and not
something like `<enum 'Scope'>`.

Note that `Consistency` is derived from `IntEnum` and not `Enum`, since
it is sometimes used in comparisons.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/buildstream/types.py b/src/buildstream/types.py
index 6f6262e41..d186c4fba 100644
--- a/src/buildstream/types.py
+++ b/src/buildstream/types.py
@@ -25,7 +25,7 @@ Foundation types
 
 """
 
-from enum import Enum
+from enum import Enum, IntEnum
 
 
 class Scope(Enum):
@@ -56,7 +56,7 @@ class Scope(Enum):
     """
 
 
-class Consistency():
+class Consistency(IntEnum):
     """Defines the various consistency states of a :class:`.Source`.
     """
 
@@ -81,7 +81,7 @@ class Consistency():
     """
 
 
-class CoreWarnings():
+class CoreWarnings(Enum):
     """CoreWarnings()
 
     Some common warnings which are raised by core functionalities within BuildStream are found in this class.