\textbf{GalRotpy} is an educational \verb+Python3+-based visual tool, which useful to undestand how the contribution of each mass component gravitational potential disc-like galaxies by means their rotation curve. Besides, allows user perform a parametric fit given curve, relies on MCMC procedure implemented using \verb+emcee+ package. Here built from Miyamoto-Nagai model for bulge/core and thi...