2. The topology system¶

As shown briefly in Overview over MDAnalysis, the Universe class is the primary object and core interface to molecular dynamics data in MDAnalysis. When loading topology information from a file, as with

>>> from MDAnalysis import Universe
>>> from MDAnalysis.tests.datafiles import PSF
>>> u = Universe(PSF)

the file is read, the contents parsed, and a Topology object is constructed from these contents.