PyQDataSet and PyDatum are wrappers which make infix operations possible with these Das2 objects. For example, calling ds+2 calls the method __add__(2) of the PyQDataSet called ds. Additionally, PyQDataSets can always be modified and a copy of the data might be made to allow this, since QDataSets are often immutable.

Additional commands are added to Jython to make it more useful, like the dataset command which converts Python arrays and Datums into QDataSets and getDataSet which reads URIs into a PyQDataSet for scripting.

This package contains support for completions and control GUI generation. Both of these have the similar task that they need to quickly generate code which can be executed to get a result. For example, when completions are triggered, we run a simplified version of the script which allows us to query for completions. When a GUI is needed a simplified version of the script which only has the "getParam" calls is created.

This package also implements argument types and constraints on these types.

Type	TypeCode	Description	Constraints
Num	F	Number	min,max,values
Str	A	String	regex,values,stringType
Time Range	T	Time range	min,max,values
resourceURI	R	Resource URI	regex,glob
URI	U	URI	regex,glob
URL	L	URL	regex,glob
File	M	Local file or directory	values
Datum	D	Physical value (5 cm) or nominal value (Chicago)	regex,glob,values
DatumRange	S	Physical range (5-10 cm, 2026-08-24)	values
Color	C	Color	values

Constraints:

values -- list of allowed values
min -- the minimum allowed value
max -- the maximum allowed value
regex -- regular expression (*\.cdf) which must be matched.
glob -- glob pattern (*.cdf) which much be matched.
format -- if URI template with $Y etc, then reformat with this, if starts with % then reformat double.
stringType -- apply type to string, can be "file" or "directory"