AttributeError: 'module' object has no attribute 'Interpreter'

[amineHorseman]

Hello,

It seems that both em and empy build a package with the same name.

When I tried to install RosAria on a fresh install of Kinetic Kame, the following error occured in file "/opt/ros/kinetic/lib/python2.7/dist-packages/genmsg/template_tools.py", Line 76:

interpreter = em.Interpreter(output=ofile, globals=g, options=em.RAW_OPT:True,em.BUFFERED_OPT:True})
AttributeError: 'module' object has no attribute 'Interpreter

I solved this problem by simply uninstalling em, and installing empy:

pip uninstall em
pip install empy

May be someone should investigate the problem?

[tfoote]

As you diagnosed em and empy are colliding in namespaces.

https://pypi.python.org/pypi/em
https://pypi.python.org/pypi/EmPy/3.3.2

I'd suggest filing a ticket upstream for em: https://github.com/ikalnitsky/em about the conflict since it appears to be a much smaller and more recent project.

For our purposes, empy is a core upstream dependency we rely upon. It needs to be installed and not the em package. If there's any package in the ROS ecosystem depending on em please ticket it. But I do not know of any such package.

[tfoote]

For cross reference it's been ticketed on em here: ikalnytskyi/em#9

[awaisk65]

Hello,

It seems that both em and empy build a package with the same name.

When I tried to install RosAria on a fresh install of Kinetic Kame, the following error occured in file "/opt/ros/kinetic/lib/python2.7/dist-packages/genmsg/template_tools.py", Line 76:

interpreter = em.Interpreter(output=ofile, globals=g, options=em.RAW_OPT:True,em.BUFFERED_OPT:True})
AttributeError: 'module' object has no attribute 'Interpreter

I solved this problem by simply uninstalling em, and installing empy:

pip uninstall em
pip install empy

May be someone should investigate the problem?

pip install empy will install the updated version, which give "em module has no attribute em.Interpreter". You need to install the downgraded version of empy.
pip install empy==3.3.4

[kamronkhakimov]

I have had the same problem. The issue seems to be the em, empy modules.
Try to use these lines of code:

pip uninstall em
pip install empy==3.3.4