Merge pull request #1480 from pre-commit/random_meth

use the shuffle method of Random instead

azure-pipelines.yml

@@ -10,7 +10,7 @@ resources:
       type: github
       endpoint: github
       name: asottile/azure-pipeline-templates
-      ref: refs/tags/v1.0.0
+      ref: refs/tags/v2.0.0
 
 jobs:
 - template: job--pre-commit.yml@asottile
@@ -40,7 +40,7 @@ jobs:
       displayName: install swift
 - template: job--python-tox.yml@asottile
   parameters:
-    toxenvs: [pypy3, py36, py37, py38]
+    toxenvs: [pypy3, py36, py37, py38, py39]
     os: linux
     pre_test:
     - task: UseRubyVersion@0

pre_commit/languages/helpers.py

@@ -18,7 +18,7 @@ from pre_commit.xargs import xargs
 if TYPE_CHECKING:
     from typing import NoReturn
 
-FIXED_RANDOM_SEED = 1542676186
+FIXED_RANDOM_SEED = 1542676187
 
 
 def run_setup_cmd(prefix: Prefix, cmd: Tuple[str, ...]) -> None:
@@ -92,7 +92,7 @@ def _shuffled(seq: Sequence[str]) -> List[str]:
     fixed_random.seed(FIXED_RANDOM_SEED, version=1)
 
     seq = list(seq)
-    random.shuffle(seq, random=fixed_random.random)
+    fixed_random.shuffle(seq)
     return seq
 
 

tests/languages/helpers_test.py

@@ -78,5 +78,5 @@ def test_target_concurrency_cpu_count_not_implemented():
 
 def test_shuffled_is_deterministic():
     seq = [str(i) for i in range(10)]
-    expected = ['3', '7', '8', '2', '4', '6', '5', '1', '0', '9']
+    expected = ['4', '0', '5', '1', '8', '6', '2', '3', '7', '9']
     assert helpers._shuffled(seq) == expected