From 8a1901c642fb9f35069648f3ad2a31bdb8ea213f Mon Sep 17 00:00:00 2001
From: jeroen_decroos <jeroen.decroos@nuance.com>
Date: Tue, 21 Jan 2020 18:43:42 +0100
Subject: [PATCH] #257: initialize platforms as list

---
 packaging/tags.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/packaging/tags.py b/packaging/tags.py
index 20512aaf9..1c1430a4d 100644
--- a/packaging/tags.py
+++ b/packaging/tags.py
@@ -328,8 +328,7 @@ def compatible_tags(
     """
     if not python_version:
         python_version = sys.version_info[:2]
-    if not platforms:
-        platforms = _platform_tags()
+    platforms = list(platforms or _platform_tags())
     for version in _py_interpreter_range(python_version):
         for platform_ in platforms:
             yield Tag(version, "none", platform_)