Python 3.4 and 2.7: Cannot install numpy package for python 3.4

Question

I am using Ubuntu 12.04 and want to use python 3.4 side by side with python 2.7.

The installation of python 3.4 worked properly. However, I cannot install the numpy

Answer 1

Solved by incrementing the python-dev package until I hit the right one. May need to be incremented further in the future. Poor implementation by python developers.

sudo apt-get install python3.7-dev