bpo-38771: Explict test for None in code example (GH-17108)
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index 90a3f4b..a5e8d04 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -162,7 +162,7 @@
parser.add_argument('-u', '--user')
parser.add_argument('-c', '--color')
namespace = parser.parse_args()
- command_line_args = {k:v for k, v in vars(namespace).items() if v}
+ command_line_args = {k: v for k, v in vars(namespace).items() if v is not None}
combined = ChainMap(command_line_args, os.environ, defaults)
print(combined['color'])