signal, socket, and ssl module IntEnum constant name lookups now return a

consistent name for values having multiple names.  Ex: signal.Signals(6)
now refers to itself as signal.SIGALRM rather than flipping between that
and signal.SIGIOT based on the interpreter's hash randomization seed.

This helps finish issue27167.

1 files changed, 8 insertions, 2 deletions

diff --git a/Lib/enum.py b/Lib/enum.py
index c3a0a8b..99db9e6 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -550,8 +550,14 @@ class Enum(metaclass=EnumMeta):
             source = vars(source)
         else:
             source = module_globals
-        members = {name: value for name, value in source.items()
-                if filter(name)}
+        # We use an OrderedDict of sorted source keys so that the
+        # _value2member_map is populated in the same order every time
+        # for a consistent reverse mapping of number to name when there
+        # are multiple names for the same number rather than varying
+        # between runs due to hash randomization of the module dictionary.
+        members = OrderedDict((name, source[name])
+                              for name in sorted(source.keys())
+                              if filter(name))
         cls = cls(name, members, module=module)
         cls.__reduce_ex__ = _reduce_ex_by_name
         module_globals.update(cls.__members__)