diff -ur patsy-0.5.1/doc/conf.py patsy-0.5.1.conf/doc/conf.py
--- patsy-0.5.1/doc/conf.py	2021-07-01 14:43:43.978489944 +0200
+++ patsy-0.5.1.conf/doc/conf.py	2021-07-01 14:43:17.388064611 +0200
@@ -5,23 +5,23 @@
 copyright = u'2011-2015, Nathaniel J. Smith'
 
 import sys
-print "python exec:", sys.executable
-print "sys.path:", sys.path
+print("python exec:", sys.executable)
+print("sys.path:", sys.path)
 try:
     import numpy
-    print "numpy: %s, %s" % (numpy.__version__, numpy.__file__)
+    print ("numpy: %s, %s" % (numpy.__version__, numpy.__file__))
 except ImportError:
-    print "no numpy"
+    print ("no numpy")
 try:
     import matplotlib
-    print "matplotlib: %s, %s" % (matplotlib.__version__, matplotlib.__file__)
+    print("matplotlib: %s, %s" % (matplotlib.__version__, matplotlib.__file__))
 except ImportError:
-    print "no matplotlib"
+    print("no matplotlib")
 try:
     import IPython
-    print "ipython: %s, %s" % (IPython.__version__, IPython.__file__)
+    print("ipython: %s, %s" % (IPython.__version__, IPython.__file__))
 except ImportError:
-    print "no ipython"
+    print("no ipython")
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -67,9 +67,9 @@
 # Undocumented trick: if we def setup here in conf.py, it gets called just
 # like an extension's setup function.
 def setup(app):
-    app.add_javascript("show-code.js")
-    app.add_javascript("facebox.js")
-    app.add_stylesheet("facebox.css")
+    app.add_js_file("show-code.js")
+    app.add_js_file("facebox.js")
+    app.add_css_file("facebox.css")
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']