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Navigation Elements scripts

Simpler item retrieval using tupled subscripting

... also much clearer this way. It also supports writing elements 'in bulk'. ...
Python

Null Object Design Pattern

... one member of some group of otherwise similar elements is special for whatever reason. Most often this results in conditional statements to distinguish between ordinary elements and the primitive Null value. ...
Python

Tuples with Named Elements via Spawning

Instead of requiring the named attributes list for each instantiation of the tuple, this implementation 'Spawns' a derived tuple class that is taylored to the named attributes specified. And it is this Spawned class that is then used to instantiate tuples. This approach effectively separates the definition of the attribute names from the ...
Python

Remove duplicates from a sequence

... on some pretty subtle properties of the sequence elements, such as whether they're hashable, and whether they support full comparisons. This script defines the unique() function that tries three methods, from fastest to slowest, letting runtime exceptions pick the best method available for the sequence at hand. ...
Python

Implementation of sets using sorted lists

... a dictionary based implementation. - Flexibility -- elements do not need to be hashable, only __cmp__ is required. - Fast operations depending on the underlying data patterns. - Non-overlapping sets get united, intersected, or differenced with only log(N) element comparisons.Results are built using fast-slicing. - Algorithms ...
Python

Find the most frequent elements

... list of the most common to least common elements and their counts. If n is specified, return only the n most common elements. ...
Python

More accurate sum

... large error when summing large arrays of like elements. This script contains a function that makes sums with error less than 1e-15. It doesn't use any additional memory (although it destroys the data array), and also runs asymptotically faster for unlimited precision numbeuns asympr >/ ...
Python

PyEphem

... any asteroids, comets, or earth satellites whose orbital elements the user can provide.Additional functions are provided to compute the angular separation between two objects in the sky, to determine the constellation in which an object lies, and to find the times at which an object rises, transits, and sets on ...
Python

Splicing of lists

This script splices any number of nonempty lists as one list. Each input list may be of different length.Elements of shorter lists may be recycled when the keyword argument recycle is set to True. Any error result in an empty output list. ...
Python

ExtraMenu

This script is a variant of a Tkinter Menu which allows sub-menus to automatically open/close when the controlling button is active/inactive. Sub-menus can be instances of any arbitrary widget, such as a Pmw.ComboBox.The topmost level is a Button which, when activated, drops down a menu containing any of Buttons, separators, Labels, Checkbuttons ...
Python

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