I'm following Drake's installation instructions from here for ubuntu.
I get stuck at this line:
python3 -c 'import pydrake; print(pydrake.__file__)'
with the following error:
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/opt/drake/lib/python3.6/site-packages/pydrake/__init__.py", line 41, in <module>
from . import common
File "/opt/drake/lib/python3.6/site-packages/pydrake/common/__init__.py", line 7, in <module>
from ._module_py import *
ModuleNotFoundError: No module named 'pydrake.common._module_py'
What is the ._module_py file? I don't see it in:
/opt/drake/lib/python3.6/site-packages/pydrake/common
The python version I've got installed is 3.8.5, but I don't think that's causing any problems.
The instructions you linked to say curl -o drake.tar.gz https://drake-packages.csail.mit.edu/drake/nightly/drake-latest-bionic.tar.gz. The "bionic" there is Ubuntu's codename for 18.04. If you are using Ubuntu 20.04, then the codename is "focal", so you should use start from curl -o drake.tar.gz https://drake-packages.csail.mit.edu/drake/nightly/drake-latest-focal.tar.gz so that you have Python 3.8 support.
Here are Drake's own installation instructions for pydrake, which are usually the most up-to-date reference: https://drake.mit.edu/python_bindings.html#installation