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-rw-r--r--numpy/lib/format.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/numpy/lib/format.py b/numpy/lib/format.py
index 9b8f90dbd..6ac66c22a 100644
--- a/numpy/lib/format.py
+++ b/numpy/lib/format.py
@@ -606,7 +606,7 @@ def _read_array_header(fp, version):
if EXPECTED_KEYS != d.keys():
keys = sorted(d.keys())
msg = "Header does not contain the correct keys: {!r}"
- raise ValueError(msg.format(d.keys()))
+ raise ValueError(msg.format(keys))
# Sanity-check the values.
if (not isinstance(d['shape'], tuple) or