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-rw-r--r--Lib/sre_compile.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/sre_compile.py b/Lib/sre_compile.py
index e48be72285..1c54f67a49 100644
--- a/Lib/sre_compile.py
+++ b/Lib/sre_compile.py
@@ -145,7 +145,7 @@ def _compile(code, pattern, flags):
def _compile_charset(charset, flags, code, fixup=None):
# compile charset subprogram
emit = code.append
- if not fixup:
+ if fixup is None:
fixup = lambda x: x
for op, av in _optimize_charset(charset, fixup):
emit(OPCODES[op])