No module named '_bz2' in python3
If you compiling python yourself, you need to install libbz2 headers and .so files first, so that python will be compiled with bz2 support.
On ubuntu, apt-get install libbz2-dev then compile python.
When trying to execute the following command:

import matplotlib.pyplot as plt

The following error occurs:

from _bz2 import BZ2Compressor, BZ2Decompressor ImportError: No module
  named '_bz2'

So, I was trying to install bzip2 module in Ubuntu using :

sudo pip3 install bzip2

But, the following statement pops up in the terminal:

Could not find a version that satisfies the requirement bzip2 (from
  versions: ) No matching distribution found for bzip2

What can I do to solve the problem?