gui.helper.ReverseDict Class Reference

A dictionary which can look up values by key, and keys by value. More...

Inheritance diagram for gui.helper.ReverseDict:

Public Member Functions
def	__init__ (self, *args, **kw)
	Initialise the data structures. More...
def	__setitem__ (self, key, value)
	Set a new key / value pair. More...
def	__delitem__ (self, key)
	Remove a key / value pair out of both dictionaries. More...

Public Attributes
	reverse
	Dictionary to store the reverse data. More...

Detailed Description

A dictionary which can look up values by key, and keys by value.

All values and keys must be hashable, and unique.

Example:

>>> a = gui.helper.ReverseDict(((1,2),(3,4)))
>>> print a[1]
2
>>> print a.reverse[2]
1
>>> a["123"] = 67
>>> print a["123"]
67
>>> print a.reverse[67]
123

Idea:

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/415903

Constructor & Destructor Documentation

__init__()

def gui.helper.ReverseDict.__init__	(		self,
		*	args,
		**	kw
	)

Initialise the data structures.

Member Function Documentation

__delitem__()

def gui.helper.ReverseDict.__delitem__	(		self,
			key
	)

Remove a key / value pair out of both dictionaries.

References gui.helper.ReverseDict.reverse.

__setitem__()

def gui.helper.ReverseDict.__setitem__	(		self,
			key,
			value
	)

Set a new key / value pair.

Already existing keys or values will be removed before adding new one.

References gui.helper.ReverseDict.reverse.

Member Data Documentation

reverse

gui.helper.ReverseDict.reverse

Dictionary to store the reverse data.

The key / value pairs are reverse stored. This means the value is used as key and the origin key is stored as value in this dictionary. Thereby a fast reverse lookup to get the corresponding key of a given value.

Referenced by gui.helper.ReverseDict.__delitem__(), and gui.helper.ReverseDict.__setitem__().

---

The documentation for this class was generated from the following file:

• gui/helper.py