bpo-38771: Explict test for None in code example (GH-17108) (GH-17110)

(cherry picked from commit 98480cef9dba04794bd61c7e7cca643d384c8c35)

Co-authored-by: Jonathan Scholbach <j.scholbach@posteo.de>

diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index e9dbd094e0a969a0ef1701a696bf0a1a3f5df8e5..6488b1260d20685185a82ed982112d6c7623e227 100644 (file)
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -162,7 +162,7 @@ environment variables which in turn take precedence over default values::
         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'])