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-rw-r--r--Lib/hmac.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/hmac.py b/Lib/hmac.py
index 4bbdbc4..5572751 100644
--- a/Lib/hmac.py
+++ b/Lib/hmac.py
@@ -15,7 +15,7 @@ digest_size = None
# A unique object passed by HMAC.copy() to the HMAC constructor, in order
# that the latter return very quickly. HMAC("") in contrast is quite
# expensive.
-_secret_backdoor_key = []
+_secret_backdoor_key = object()
class HMAC:
"""RFC 2104 HMAC class. Also complies with RFC 4231.