No module named 'numpy'

Actually I am shifting from Windows to Linux. Using pycharm on Windows I have a python 3 script that requires numpy and matplotlib to run, so I installed them on my Linux system using

sudo apt-get install python3-numpy
sudo apt-get install matplotlib3-numpy

But still when I try to run the script I get error:

from python3-numpy import  *
                ^
SyntaxError: invalid syntax

or:

from numpy import  *
ImportError: No module named 'numpy'

You need to install numpy using pip
install pip :

sudo apt-get install python-pip python3-pip

Then install numpy using pip

sudo pip3 install -U numpy

Are you sure that you run python3 and not just python, which defaults to python2.7 on most systems.

You can get the Version of python with

python --version

or

python3 --version