The window shows nothing

[111116]

I've successfully run the script with python GoblinEscape.py. No errors, but there's simply nothing in the pygame window. Here's some version info:

$ python
Python 2.7.10 (default, Feb 22 2019, 21:55:15) 
[GCC 4.2.1 Compatible Apple LLVM 10.0.1 (clang-1001.0.37.14)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import pygame
pygame 1.9.6
Hello from the pygame community. https://www.pygame.org/contribute.html

[setanarut]

it works with python3 and latest pygame.

> python GoblinEscape.py 
pygame 2.0.0.dev10 (SDL 2.0.12, python 3.8.5)
Hello from the pygame community. https://www.pygame.org/contribute.html