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-rw-r--r--sphinx/ext/coverage.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/ext/coverage.py b/sphinx/ext/coverage.py
index 3cf0ff55c..a55da2f5b 100644
--- a/sphinx/ext/coverage.py
+++ b/sphinx/ext/coverage.py
@@ -213,7 +213,7 @@ class CoverageBuilder(Builder):
try:
if self.config.coverage_write_headline:
write_header(op, 'Undocumented Python objects', '=')
- keys = self.py_undoc.keys()
+ keys = list(self.py_undoc.keys())
keys.sort()
for name in keys:
undoc = self.py_undoc[name]