selectors

Selector(*args, **kwargs)	Selector class
Selector.components(self)	List of selector components, each an instance of SelectorComponent.
Selector.refine(self, *args, **kwargs)	Add components to this selector using the same syntax as the constructor.
Selector.clone(self)	Makes a copy of this Selector.
Selector.select(self, variable, *args, **kwargs)	Extract the selection from a variable.
SelectorComponent()	Base class representing selection for a given set of axes.
SelectorComponent.specify(self, slab, axes, …)	Refine the specification suitable for slab.subRegion Set confined_by to yourself for each axis you confine.
SelectorComponent.specifyGrid(self, var, …)	Refine the specification suitable for grid.intersect().
SelectorComponent.post(self, fetched, slab, …)	Post-process fetched if desired, return new value.
axisComponent(id, spec)	A SelectorComponent that confines exactly one axis or coordinate dimension (e.g.
axisComponent.specify(self, slab, axes, …)	Do specification for axis self.id; skip if axis not present.
coordinateComponent(id, spec)	A SelectorComponent that confines exactly one coordinate dimension (e.g., latitude)
coordinateComponent.specifyGrid(self, var, …)	Determine if this component confines the grid, and if so set the specs and return 1
requiredComponent(ids)	Checks to see that a specific id axis must be present.
requiredComponent.specify(self, slab, axes, …)	Doesn’t confine but checks for existance
indexComponent(id[, start, stop, stride])	An axisComponent that confines exactly one axis by specifying indices.
indexedComponent(index, value)	A SelectorComponent that confines exactly one axis whose index is given.
indexedComponent.specify(self, slab, axes, …)	Do the specification for axis whose index is self.index.
positionalComponent(v)	A SelectorComponent that confines the next axis available.
positionalComponent.specify(self, slab, …)	Find the next unconfined axis and confine it.