I installed a Python package using pip3. When I imported that newly installed package, it complained about IPython:
ImportError: No module named 'IPython.paths'
It turns out that only recent versions of the IPython package had
IPython.paths. I had an older version of IPython installed using apt. The newly installed pip3 package was built around a more recent version of IPython. The problem went away once I removed the IPython packaged installed using apt and force installed its recent pip3 package:
$ sudo apt remove ipython $ sudo pip3 install --upgrade ipython
Tried with: Ubuntu 16.04