Implement random_choices for Python 2

Apparently py2k has no random.choices, so make a quick
one for the tests that use it.

Change-Id: Iadc3442b35f400b5bab0f711b7d3ede5dbc28f52

2 files changed, 18 insertions, 2 deletions

diff --git a/lib/sqlalchemy/testing/util.py b/lib/sqlalchemy/testing/util.py
index dbe6a383d..5244d0d37 100644
--- a/lib/sqlalchemy/testing/util.py
+++ b/lib/sqlalchemy/testing/util.py
@@ -66,6 +66,21 @@ def picklers():
             yield pickle_.loads, lambda d: pickle_.dumps(d, protocol)
 
 
+if py2k:
+
+    def random_choices(population, k=1):
+        pop = list(population)
+        # lame but works :)
+        random.shuffle(pop)
+        return pop[0:k]
+
+
+else:
+
+    def random_choices(population, k=1):
+        return random.choices(population, k=k)
+
+
 def round_decimal(value, prec):
     if isinstance(value, float):
         return round(value, prec)
diff --git a/test/sql/test_compare.py b/test/sql/test_compare.py
index f8fc43ba5..6a2d47c20 100644
--- a/test/sql/test_compare.py
+++ b/test/sql/test_compare.py
@@ -59,6 +59,7 @@ from sqlalchemy.testing import is_false
 from sqlalchemy.testing import is_not_
 from sqlalchemy.testing import is_true
 from sqlalchemy.testing import ne_
+from sqlalchemy.testing.util import random_choices
 from sqlalchemy.util import class_hierarchy
 
 
@@ -392,13 +393,13 @@ class CoreFixtures(object):
         lambda: (
             # same number of params each time, so compare for IN
             # with legacy behavior of bind for each value works
-            column("x").in_(random.choices(range(10), k=3)),
+            column("x").in_(random_choices(range(10), k=3)),
             # expanding IN places the whole list into a single parameter
             # so it can be of arbitrary length as well
             column("x").in_(
                 bindparam(
                     "q",
-                    random.choices(range(10), k=random.randint(0, 7)),
+                    random_choices(range(10), k=random.randint(0, 7)),
                     expanding=True,
                 )
             ),