No module named sympy

you can also do it in the jupyter notebook. Write in a cell this, and Run that cell:

!pip install --upgrade
!pip install sympy 
import sympy

If your kernel uses python3, then use "pip3" instead. You may have to do Kernel->Restart, if it doesn't work straight away.

If it still doesn't find the module because Jupyter doesn't load the correct folder where it is installed. then consider doing either

import sys
sys.path.append('my/path/to/module/folder') 
#the (successful) line "!pip install sympy " should tell you where this path is

or (on the bash terminal)

echo "PYTHONPATH=\"$PYTHONPATH:my/path/to/module/folder\"" >> ~/.bashrc
source ~/.bashrc
# then restart jupyter notebook 

Given that you are new to Python I would advise that you install a distribution that already includes the complete scientific python stack such as WinPython or Anaconda. If it is specifically sympy you are after you can play around online at Sympy live. If you want to stick to your distribution try installing sympy with

pip install sympy

rather than downloading it manually.