12. Core modules

The MDAnalysis.core modules contain functionality essential for MDAnalysis, such as the central data structures in MDAnalysis.core.universe and MDAnalysis.core.groups or the selection definitions and parsing in MDAnalysis.core.selection.

• 12.1. Core functions of MDAnalysis

12.2. Important objects for users

All users of MDAnalysis need to understand the two most important classes in this section, namely the Universe and the AtomGroup.

• 12.2.1. Core object: Universe — MDAnalysis.core.universe
• 12.2.2. Core objects: Containers — MDAnalysis.core.groups

12.3. Topology system

The topology system is primarily of interest to developers.

• 12.3.1. Core Topology object — MDAnalysis.core.topology
• 12.3.2. Core Topology Objects — MDAnalysis.core.topologyobjects
• 12.3.3. Topology attribute objects — MDAnalysis.core.topologyattrs

See also

Developer notes for Topology Parsers

12.4. Selection system

The selection system is primarily of interest to developers.

• 12.4.1. Atom selection Hierarchy — MDAnalysis.core.selection