unique¶

utils.unique(seq, idfun=None)[source]¶

Finds the unique items in a list and returns them in order found.

Inspired by discussion on http://www.peterbe.com/plog/uniqifiers-benchmark Notably f10 Andrew Dalke and f8 by Dave Kirby

Parameters:	seq (an iterable object) – The sequence from which the unique list will be compiled idfun (function, optional) – A hashing function for transforming the items into the form that is to be compared. Default is the `None`
Returns:	result – The list of unique items
Return type:	list

Examples

>>> a=list('ABeeE')
>>> unique(a)
['A', 'B', 'e', 'E']

>>> unique(a, lambda x: x.lower())
['A', 'B', 'e']

Note

Unless order is needed it is best to use list(set(seq))