I have no idea why, but this fixes the broken doctest.

Fabian Pedregosa · Fabian Pedregosa · commit 4285ab778104 · 2011-05-10T15:14:54.000+02:00
BTW, Only reproductible when run from python -c "..."
diff --git a/scikits/learn/metrics/metrics.py b/scikits/learn/metrics/metrics.py
@@ -160,9 +160,8 @@ def auc(x, y):
     >>> y = np.array([1, 1, 2, 2])
     >>> pred = np.array([0.1, 0.4, 0.35, 0.8])
     >>> fpr, tpr, thresholds = metrics.roc_curve(y, pred)
-    >>> print metrics.auc(fpr, tpr)
+    >>> metrics.auc(fpr, tpr)
     0.75
-
     """
     x = np.asanyarray(x)
     y = np.asanyarray(y)
