syntax error in line 146

[OneDudeDesign]

I get the following error running the latest pull the carrot is pointing to the single quote after "walls."

D:\onedudedesign\MazeModelCreation\3d-maze-generator>python maze.py output.scad
File "maze.py", line 146
print 'running Prim's alg on potentially %d walls.' % (6 * height * width * depth)

[OneDudeDesign]

I was running Python 3.6 and I corrected this error and others but when it runs all the way to the output it fails saying NoneType found.