what is the difference between the python and ipython, you can refer to the website:https://www.quora.com/What-is-the-difference-between-IPython-and-Python
Besides, note that the website: www.quora.com is a good website to get the answer and information about everything encountered in your life.
when I download the python3.5, I need to install the .tgz file. Then, tar -xvzf .tgz;
cd the newly created file, ./configure
make
sudo make install.
In fact, you can refer to the README in the folder. refer to: http://www.linuxquestions.org/questions/linux-newbie-8/installing-tgz-file-898795/
question about ubuntu: refer to http://askubuntu.com/
http://www.linuxquestions.org/
about the IPython-Notebook, you can refer to https://www.quora.com/What-is-iPython-notebook