[python] Odstraneni duplicitnich retezcu

[VANEK Petr]

>   od verze 2.3 podporuje Python knihovnu sets, coz
> jsou  netridene seznamy unikatnich polozek. Takze
> podle mne nejjednodussi je toto:

skvela poznamka, o tom jsem nevedel. Hodne to zjednodusuje hromadu
operaci.

Akorat ja mam v dokumentaci:
"A set object is an unordered collection of immutable values. Common
uses include membership testing, removing duplicates from a sequence,
and computing mathematical operations such as intersection, union,
difference, and symmetric difference. New in version 2.4."

kde bych vypichnul tu 2.4...
p.