diff --git a/lib/ansible/constants.py b/lib/ansible/constants.py
index 1e5445372f..744b67f63c 100644
--- a/lib/ansible/constants.py
+++ b/lib/ansible/constants.py
@@ -86,12 +86,12 @@ DEFAULT_SUDO_PASS = None
 DEFAULT_REMOTE_PASS = None
 DEFAULT_SUBSET = None
 DEFAULT_SU_PASS = None
-IGNORE_FILES = ["COPYING", "CONTRIBUTING", "LICENSE", "README", "VERSION", "GUIDELINES"]  # ignore during module search
-INTERNAL_RESULT_KEYS = ['add_host', 'add_group']
-LOCALHOST = frozenset(['127.0.0.1', 'localhost', '::1'])
-MODULE_REQUIRE_ARGS = ['command', 'win_command', 'shell', 'win_shell', 'raw', 'script']
-MODULE_NO_JSON = ['command', 'win_command', 'shell', 'win_shell', 'raw']
-RESTRICTED_RESULT_KEYS = ['ansible_rsync_path', 'ansible_playbook_python']
+IGNORE_FILES = ("COPYING", "CONTRIBUTING", "LICENSE", "README", "VERSION", "GUIDELINES")  # ignore during module search
+INTERNAL_RESULT_KEYS = ('add_host', 'add_group')
+LOCALHOST = ('127.0.0.1', 'localhost', '::1')
+MODULE_REQUIRE_ARGS = ('command', 'win_command', 'shell', 'win_shell', 'raw', 'script')
+MODULE_NO_JSON = ('command', 'win_command', 'shell', 'win_shell', 'raw')
+RESTRICTED_RESULT_KEYS = ('ansible_rsync_path', 'ansible_playbook_python')
 TREE_DIR = None
 VAULT_VERSION_MIN = 1.0
 VAULT_VERSION_MAX = 1.0