traitlets.traitlets.TraitError in Pycharm

Question

I am a beginner in python. I am facing the following problem.

Whenever I start pycharm Community edition (version 5.0.3), the Python console fails to starts and shows th

Answer 1

I had the same issue. I solved this by updating ipython.

My version was 3.1.0, upgrading it to 4.1.1 solved it.

in my case:

workon project
pip install -U ipython

Answer 2

I've found that this happened because I had installed ipython version 4.x, and then reverted to 3.2.0, without uninstalling the traitlets more advanced version first. This did the trick then:

pip uninstall ipython[all]
pip uninstall traitlets
pip install ipython==3.2.0

Answer 3

I initially tried unsuccessfully by trying

pip install -U ipython

But then tried following and it worked:

pip uninstall ipython[all]
pip uninstall traitlets
pip install ipython

Thanks @mirandes

Answer 4

In my case, this was due to a conflicting installation of IPython through pip and apt. Removing the apt-installed version using sudo apt remove ipython fixed the problem.