This lab session will mainly be held as demonstrative session, <a href="http://fides.fe.uni-lj.si/pyopus/download/0.9/docsrc/_build/html/gui.html">based on tutorial</a> for PyOPUS package usage. <a href="http://fides.fe.uni-lj.si/pyopus/index.html">PyOPUS</a> is a Python library for circuit optimization and optimization methods development. We will learn how to use the graphical environment and run a simple optimization loop.