If you ever wanted to use ipdb (from IPython) debugger when using Python 2.7, you might have faced an issue like this:
$ sudo pip install ipython Downloading/unpacking ipython Downloading ipython-6.0.0.tar.gz (5.1MB): 5.1MB downloaded Running setup.py (path:/tmp/pip_build_root/ipython/setup.py) egg_info for package ipython IPython 6.0+ does not support Python 2.6, 2.7, 3.0, 3.1, or 3.2. When using Python 2.7, please install IPython 5.x LTS Long Term Support version. Beginning with IPython 6.0, Python 3.3 and above is required. ... Command python setup.py egg_info failed with error code 1 in /tmp/pip_build_root/ipython
So you gotta go ahead and install IPython==5.0, because it’s the last LTS version. Do:
#pip install IPython==5.0
And then you should get:
ImportError: No module named packaging.version
Hm, that was not expected. Installing setuptools or packaging did not work for me at this moment. To get away with this error I had to install pip3 and then upgrade pip:
251 sudo apt-get install python3-pip 252 sudo pip3 install --upgrade pip 253 sudo pip install ipython==5.0 254 sudo pip install ipdb
After that, both IPython and ipdb installed with no issues or errors and life was happy again.
If the above still does not fix the issue, or if pip and ipython are bound to python 3, you can try this, according described in the packaging.python.org website:
- Download get-pip.py
python get-pip.py.  This will install or upgrade pip. Additionally, it will install setuptools and wheel if they’re not installed already.
Let me know if that worked for you too.