1 files changed, 2 insertions, 4 deletions
diff --git a/numpy/core/numeric.py b/numpy/core/numeric.py
index 7ade3d224..4ff12dbbd 100644
--- a/numpy/core/numeric.py
+++ b/numpy/core/numeric.py
@@ -2914,15 +2914,13 @@ True_ = bool_(True)
 
 
 def extend_all(module):
-    adict = {}
-    for a in __all__:
-        adict[a] = 1
+    existing = set(__all__)
     try:
         mall = getattr(module, '__all__')
     except AttributeError:
         mall = [k for k in module.__dict__.keys() if not k.startswith('_')]
     for a in mall:
-        if a not in adict:
+        if a not in existing:
             __all__.append(a)