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-rw-r--r--numpy/lib/index_tricks.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/numpy/lib/index_tricks.py b/numpy/lib/index_tricks.py
index 538b32ea2..d145477c3 100644
--- a/numpy/lib/index_tricks.py
+++ b/numpy/lib/index_tricks.py
@@ -369,7 +369,9 @@ class AxisConcatenator:
trans1d = int(vec[2])
continue
except Exception as e:
- raise ValueError("unknown special directive {!r}".format(item)) from e
+ raise ValueError(
+ "unknown special directive {!r}".format(item)
+ ) from e
try:
axis = int(item)
continue