bpo-40325: Deprecate set object support in random.sample() (GH-19591)
diff --git a/Lib/random.py b/Lib/random.py
index 3243938..f1df18d 100644
--- a/Lib/random.py
+++ b/Lib/random.py
@@ -367,9 +367,12 @@
# causing them to eat more entropy than necessary.
if isinstance(population, _Set):
+ _warn('Sampling from a set deprecated\n'
+ 'since Python 3.9 and will be removed in a subsequent version.',
+ DeprecationWarning, 2)
population = tuple(population)
if not isinstance(population, _Sequence):
- raise TypeError("Population must be a sequence or set. For dicts, use list(d).")
+ raise TypeError("Population must be a sequence. For dicts or sets, use sorted(d).")
randbelow = self._randbelow
n = len(population)
if not 0 <= k <= n: