Support sampling from enums

docs/changes.rst

@@ -23,9 +23,13 @@ information to the contrary.
 
 
 ------------------
-3.8.4 - 2017-05-12
+3.8.4 - 2017-05-14
 ------------------
 
+This is a compatibility bugfix release.  ``sampled_from`` no longer raises
+a deprecation warning when sampling from an ``Enum``, as all enums have a
+reliable iteration order.
+
 Instead of unconditionally importing ``sqlite3``, Hypothesis now imports it
 when a SQLite database is first used.  This was the major blocker for BSD
 support with default settings.

src/hypothesis/internal/conjecture/utils.py

@@ -17,6 +17,7 @@
 
 from __future__ import division, print_function, absolute_import
 
+import enum
 import math
 from collections import Sequence
 
@@ -104,7 +105,7 @@ def centered_integer_range(data, lower, upper, center):
 
 
 def check_sample(values):
-    if not isinstance(values, Sequence):
+    if not isinstance(values, (Sequence, enum.EnumMeta)):
         note_deprecation(
             ('Cannot sample from %r, not a sequence.  ' % (values,)) +
             'Hypothesis goes to some length to ensure that sampling an '