diff -ur patsy-0.5.1/doc/spline-regression.rst patsy-0.5.1.print/doc/spline-regression.rst
--- patsy-0.5.1/doc/spline-regression.rst	2015-11-09 06:01:53.000000000 +0100
+++ patsy-0.5.1.print/doc/spline-regression.rst	2019-02-13 17:40:16.579986365 +0100
@@ -179,7 +179,7 @@
       ....:            {"x1": x1.ravel(), "x2": x2.ravel(), "df": df})
       ....:
 
-   In [80]: print y.shape
+   In [80]: print(y.shape)
 
    In [90]: fig = plt.figure()