已安装Ipython3，但版本仍显示1.2.1

Question

The python version I have is 3.4.3. I tried using the Ipython3 qtconsole but same issue

Answer 1

The ipython3 executable just means "IPython for Python 3", it doesn't have any relationship to the version of IPython itself. IPython 1.2.1 is still the current version that ships with some Linux distros, so if you installed with apt-get or yum , this is likely the reason. If you want a more recent version, you can install with pip :

python3 -m pip install --upgrade ipython

If pip list shows a recent version of IPython, but starting ipython still shows an old version, it could be because setuptools has corrupted your path via a file called easy-install.pth . Look for these files on your system, and check if there are any /usr/lib/python3.4/dist-packages in there. If so, remove those lines because it's wrong for that path to be included in the file.

You may also remove the outdated IPython with

apt-get remove ipython