>>> from capgira import swap

--ini-enunciat

>>> it = iter('ABCDEFGH')
>>> for x in swap(it):
...     print(x, end=',')
B,A,D,C,F,E,H,G,
>>> next(it, 'the end')   # comprova que s'ha retornat un iterador i que ara s'ha exhaurit
'the end'
>>> it = iter(range(7))
>>> for x in swap(it):     # si l'iterador té un nombre senar d'elements,
...     print(x, end=',')  # el darrer element també cal generar-lo
1,0,3,2,5,4,6,

--fi-enunciat

>>> for x in swap(iter('ABRACADABRA')):
...     print(x, end=',')  
B,A,A,R,A,C,A,D,R,B,A,
 
>>> for x in swap(iter(range(1,200,7))):
...     print(x, end=',')  
8,1,22,15,36,29,50,43,64,57,78,71,92,85,106,99,120,113,134,127,148,141,162,155,176,169,190,183,197,

>>> for x in swap(iter('a cap cap no cap el que cap al meu cap'.split())):
...     print(x, end=',')  
cap,a,no,cap,el,cap,cap,que,meu,al,cap,