Parameters

Parameter	An attribute descriptor for declaring parameters.
String	A String Parameter, with a default value and optional regular expression (regex) matching.
Bytes	A Bytes Parameter, with a default value and optional regular expression (regex) matching.
Color	Color parameter defined as a hex RGB string with an optional # prefix or (optionally) as a CSS3 color name.
Boolean	Binary or tristate Boolean Parameter.
Event	An Event Parameter is one whose value is intimately linked to the triggering of events for watchers to consume.
Dynamic	Parameter whose value can be generated dynamically by a callable object.
Number	A numeric Dynamic Parameter, with a default value and optional bounds.
Integer	Numeric Parameter required to be an Integer
Magnitude	Numeric Parameter required to be in the range [0.0-1.0].
Tuple	A tuple Parameter (e.g. ('a',7.6,[3,5])) with a fixed tuple length.
NumericTuple	A numeric tuple Parameter (e.g. (4.5,7.6,3)) with a fixed tuple length.
XYCoordinates	A NumericTuple for an X,Y coordinate.
Range	A numeric range with optional bounds and softbounds.
Date	Date parameter of datetime or date type.
DateRange	A datetime or date range specified as (start, end).
CalendarDate	Parameter specifically allowing dates (not datetimes).
CalendarDateRange	A date range specified as (start_date, end_date).
List	Parameter whose value is a list of objects, usually of a specified type.
HookList	Parameter whose value is a list of callable objects.
Path	Parameter that can be set to a string specifying the path of a file or folder.
Filename	Parameter that can be set to a string specifying the path of a file.
Foldername	Parameter that can be set to a string specifying the path of a folder.
Selector	Parameter whose value must be one object from a list of possible objects.
FileSelector	Given a path glob, allows one file to be selected from those matching.
ListSelector	Variant of Selector where the value can be multiple objects from a list of possible objects.
MultiFileSelector	Given a path glob, allows multiple files to be selected from the list of matches.
ClassSelector	Parameter allowing selection of either a subclass or an instance of a class or tuple of classes.
Dict	Parameter whose value is a dictionary.
Array	Parameter whose value is a numpy array.
Series	Parameter whose value is a pandas Series.
DataFrame	Parameter whose value is a pandas DataFrame.
Callable	Parameter holding a value that is a callable object, such as a function.
Action	A user-provided function that can be invoked like a class or object method using ().
Composite	A Parameter that is a composite of a set of other attributes of the class.