artonge / gym-sudoku Goto Github PK

$ uname
Darwin

$ python --version
Python 3.6.5 :: Anaconda, Inc.

$ pip list | grep sudoku
gym-sudoku 1.0.2

$ python -c "import gym_sudoku"
Traceback (most recent call last):
File "", line 1, in
ModuleNotFoundError: No module named 'gym_sudoku'

Thanks for this environment!

It looks like this is still only for Python 2. E.g. I get NameError: name 'xrange' is not defined in gym_sudoku/envs/sudoku_env.py

Python 2 will no longer be supported as of 2020.
Python 3 is a better language, and all the major libraries support it now.
So we want to port to Python 3, as convenient, over the next few years.

Background and nice timeline diagram at http://www.python3statement.org/

Great advice, planning process, tips at at Porting Python 2 Code to Python 3

To make your project be single-source Python 2/3 compatible, the basic steps are:

1. Only worry about supporting Python 2.7
2. Make sure you have good test coverage (coverage.py can help; pip install coverage)
3. Learn the differences between Python 2 & 3
4. Use Futurize (or Modernize) to update your code (e.g. pip install future)
5. Use Pylint to help make sure you don't regress on your Python 3 support (pip install pylint)
6. Use caniusepython3 to find out which of your dependencies are blocking your use of Python 3 (pip install caniusepython3)
7. Once your dependencies are no longer blocking you, use continuous integration to make sure you stay compatible with Python 2 & 3 (tox can help test against multiple versions of Python; pip install tox)
8. Consider using optional static type checking to make sure your type usage works in both Python 2 & 3 (e.g. use mypy to check your typing under both Python 2 & Python 3).