Update opentelemetry-api/src/opentelemetry/distributedcontext/__init__.py

a-feld · Oberon00 · web-flow · commit 289066c706ae · 2019-08-27T08:02:34.000-07:00
Co-Authored-By: Christian Neumüller &lt;christian+github@neumueller.me&gt;
diff --git a/opentelemetry-api/src/opentelemetry/distributedcontext/__init__.py b/opentelemetry-api/src/opentelemetry/distributedcontext/__init__.py
@@ -15,7 +15,7 @@
 from contextlib import contextmanager
 import typing
 
-PRINTABLE = set(chr(num) for num in range(32, 127))
+PRINTABLE = frozenset(chr(num) for num in range(32, 127))
 
 
 class EntryMetadata:
