Installation problem: No module named 'retro._retro'

[Andrew-music]

Issue summary

I'm trying to install this on an iMac (High Sierra). I've set up python 3.5 and a virtual environment, and followed the instructions to install lua5.1 and the binary for the project. All was well until I tried to use it! When I'm in the project directory and type import retro to python I get back the error below. I do have a retro folder, but retro._retro, which isn't anywhere in the installation.

$ python3
Python 3.5.0 (v3.5.0:374f501f4567, Sep 12 2015, 11:00:19)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import retro
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Workdisk/retro-master/retro/__init__.py", line 8, in <module>
    from retro._retro import Movie, RetroEmulator, core_path, data_path as _data_path
ImportError: No module named 'retro._retro'
>>>

A discord user suggested I cd to the parent directory first (cd ..), but that only changed the error.

>>> import retro
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/retro/__init__.py", line 8, in <module>
    from retro._retro import Movie, RetroEmulator, core_path, data_path as _data_path
ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/retro/_retro.cpython-35m-darwin.so, 2): Symbol not found: __PyThreadState_UncheckedGet
  Referenced from: /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/retro/_retro.cpython-35m-darwin.so
  Expected in: flat namespace
 in /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/retro/_retro.cpython-35m-darwin.so

System information

• MacOS High Sierra 10.13.3
• Python 3.5.0
• Gym Retro binary for python 3.5 as downloaded on April 5, 2018

[cwgreene]

Question, what happens if you are not in the project directory?

[Andrew-music]

From other directories, I get the same error as the second attempt above, after the cd .. - the ImportError: dlopen(... one.

[cwgreene]

Sorry, didn't see that. My bad!

The issue for the first error is caused by python looking at the source directory to resolve the retro import (which will not contain _retro, as it's a shared object that gets built and placed elsewhere). As you have seen, moving directories resolves that issue.

Once past the first issue, you're hitting this one:

cython/cython#1880

To confirm, you ran pip install -e . inside the directory. What happens in that directory if you run python3.5 setup.py install?

EDIT:
Which versions of python do you have installed on your machine?

[endrift]

What did you use to install Python 3.5? The builders use miniconda.

[Andrew-music]

That was a great idea. I deleted my existing Python installs (not the native 2.7 version on the Mac, though) and installed a fresh Anaconda with Python 3.6. Then I downloaded the binary for that version from the document page, and I can import retro and run the list of games. So this may have been down to a confused Python installation, solved by just trashing everything and starting over. Thanks for the help! I think this particular issue can be considered closed.

[jimhoggey]

i have the same problem gym retori is not found when running the randome agent python.
i ran the python3.5 setup.py install command but that did not work but python3.6 setup.py install did do something.

/EGG-INFO
copying gym_retro.egg-info/top_level.txt -> build/bdist.macosx-10.12-x86_64/egg/EGG-INFO
writing build/bdist.macosx-10.12-x86_64/egg/EGG-INFO/native_libs.txt
zip_safe flag not set; analyzing archive contents...
retro.pycache.init.cpython-36: module references file
retro.pycache._retro.cpython-36: module references file
retro.data.pycache.init.cpython-36: module references file
creating dist
creating 'dist/gym_retro-0.6.0.dev45+g5af5926-py3.6-macosx-10.12-x86_64.egg' and adding 'build/bdist.macosx-10.12-x86_64/egg' to it
removing 'build/bdist.macosx-10.12-x86_64/egg' (and everything under it)
Processing gym_retro-0.6.0.dev45+g5af5926-py3.6-macosx-10.12-x86_64.egg
creating /usr/local/lib/python3.6/site-packages/gym_retro-0.6.0.dev45+g5af5926-py3.6-macosx-10.12-x86_64.egg
Extracting gym_retro-0.6.0.dev45+g5af5926-py3.6-macosx-10.12-x86_64.egg to /usr/local/lib/python3.6/site-packages
Adding gym-retro 0.6.0.dev45+g5af5926 to easy-install.pth file