Installing an interpreter

[Skipper_Dan]

getting closer, I now have Python 3 >>>, I would like to get ptpython working. here is what I get:

skipperdan@HP-Compaq ~ $ ptpython
No command 'ptpython' found, did you mean:
Command 'pvpython' from package 'paraview-python' (universe)
ptpython: command not found
skipperdan@HP-Compaq ~ $ sudo ptpython
[sudo] password for skipperdan:
sudo: ptpython: command not found
skipperdan@HP-Compaq ~ $ sudo pip install ptpython
The directory '/home/skipperdan/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/home/skipperdan/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting ptpython
Downloading ptpython-0.41-py2-none-any.whl (47kB)
100% |████████████████████████████████| 51kB 243kB/s
Collecting prompt-toolkit<2.0.0,>=1.0.14 (from ptpython)
Downloading prompt_toolkit-1.0.15-py2-none-any.whl (247kB)
100% |████████████████████████████████| 256kB 304kB/s
Collecting docopt (from ptpython)
Downloading docopt-0.6.2.tar.gz
Could not import setuptools which is required to install from a source distribution.
Please install setuptools.