$ sudo apt-get update
$ sudo apt-get install python-imposm-parser 

python-imposm-parser is installed in your system.

Make ensure the python-imposm-parser package were installed using the commands given below,

$ sudo dpkg-query -l | grep python-imposm-parser *

You will get with python-imposm-parser package name, version, architecture and description in a table

python-imposm-parser package basic information: