n,)#
A parenthesized number followed by a comma denotes a tuple with one element. The trailing comma distinguishes a one-element tuple from a parenthesized n. This is from NumPy; see https://numpy.org/doc/stable/glossary.html#term-n.
<Class>-like is an instance of the Class or a valid initializer argument for Class as Class(value). E.g. Quantity-like includes "2 * u.km" because astropy.units.Quantity("2 * u.km") works.
The physical type of a quantity can be annotated in square brackets following a Quantity (or similar quantity-like).
For example, distance : quantity-like ['length']
quantity-like and a valid initializer for Angle. The unit must be an angular. A string input is interpreted as an angle as described in the Angle documentation.
Object that implements Python’s buffer protocol.
BaseCoordinateFrame subclass instance, or a SkyCoord (or subclass) instance, or a valid initializer as described in COORD.
file-like object object that supports reading with a method read.
For a formal definition see ReadableFileLike.
file-like object object that supports writing with a method write.
For a formal definition see WriteableFileLike.
BaseCoordinateFrame subclass or subclass instance or a valid Frame name (string).
quantity-like and a valid initializer for Distance. The unit must be a convertible to a unit of length.
Quantity (or subclass) instance, a number or array-like object, or a string which is a valid initializer for Quantity.
For a formal definition see QuantityLike.
Table (or subclass) instance or valid initializer for Table as described in Constructing a Table. Common types include dict[list], list[dict], list[list], and ndarray (structured array).
Time (or subclass) instance or a valid initializer for Time, e.g. str, array-like[str], datetime, or datetime64.
In short, a trait type is a class with the following properties:
It is a class that can be used as a mixin to add functionality to another class.
It should never be instantiated directly.
It should not be used as a base class for other classes, but only as a mixin.
It can define methods, properties, and attributes – any of which can be abstract.
It can be generic, i.e. it can have type parameters.
It can subclass other traits, but should have a linear MRO.
These are the same set of properties as orthogonal mixin classes, with the added emphasis that they can serve as compiled types, if so enabled by a compilation system such as mypyc.
UnitBase subclass instance or a valid initializer for Unit, e.g., str or scalar Quantity.
Any valid Matplotlib color.
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