DESCRIPTION.

Supprime les éléments d'un ensemble s'ils sont dans d'autres ensembles. 

SYNTAXE.

ESB_Ensemble.difference_update ( ensemblea , ... , ensemblen )

ESB_Ensemble ⇨ nom de l'ensemble [ OBLIGATOIRE ]

.difference_update ( ) ⇨ appel de la méthode [ OBLIGATOIRE ]

ensemblea , ... , ensemblen ⇨ liste d'ensembles [ OBLIGATOIRE ]

ESB_Ensemble -= ensemblea | ... | ensemblen

ESB_Ensemble ⇨  nom de l'ensemble [ OBLIGATOIRE ]

-= ⇨ opérateur de décrémentation [ OBLIGATOIRE ]

ensemblea | ... | ensemblen ⇨ liste d'ensembles [ OBLIGATOIRE ]

REMARQUE.

ensemblea , ... , ensemblen doivent être des objets de même type que ESB_Ensemble, ou compatible avec lui.

EXEMPLES.

ESB_Pairs = set ( range ( 0 , 26 , 2 ) )

ESB_Carres = { 4 , 9 , 16 , 25 }

ESB_Suite = set ( range ( 26 ) )

ESB_Suite.difference_update ( ESB_Pairs )

print ( ESB_Suite ) retourne {1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25}

ESB_Suite.difference_update ( ESB_Carres ) 

print ( ESB_Suite ) retourne {1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23}

ESB_Suite = set ( range ( 26 ) )

ESB_Suite.difference_update ( ESB_Pairs , ESB_Carres ) 

print ( ESB_Suite ) retourne {1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23}

ESB_Suite = set ( range ( 26 ) )

ESB_Suite -= ESB_Pairs

print ( ESB_Suite ) retourne {1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25}

ESB_Suite -= ESB_Carres

print ( ESB_Suite ) retourne {1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23}

ESB_Suite = set ( range ( 26 ) )

ESB_Suite -= ESB_Carres | ESB_Pairs 

print ( ESB_Suite ) retourne {1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23}