>>> import itertools
>>> from sumesp import sumes_parcials

>>> it1 = iter(range(100))
>>> it2 = iter([2, 5, 1, 2, 6])
>>> itsum = sumes_parcials(it1, it2) 
>>> list(itsum) # doctesttag: +TAG=1_sumesp
[1, 20, 7, 17, 75]

>>> l1 = [1,-6,77,8,99,19,-22,67,-12,55,89,9,0,11,-2]
>>> l2 = [3,1,4,7]
>>> for x in sumes_parcials(iter(l1), iter(l2)): # doctesttag: +TAG=1_sumesp
...     print(x, end=',')
72,8,163,150,

>>> for x in sumes_parcials(iter(l1), iter([1,2]*5)): # doctesttag: +TAG=1_sumesp
...     print(x, end=',')
1,71,8,118,-22,55,55,98,0,9,

>>> for x in sumes_parcials(itertools.count(), iter([1000]*10)): # doctesttag: +TAG=1_sumesp
...     print(x, end=',')
499500,1499500,2499500,3499500,4499500,5499500,6499500,7499500,8499500,9499500,

>>> list(sumes_parcials(iter([3]*10), iter([2]*5))) # doctesttag: +TAG=1_sumesp
[6, 6, 6, 6, 6]

>>> list(sumes_parcials(iter([3,4]*6), iter([3]*4))) # doctesttag: +TAG=1_sumesp
[10, 11, 10, 11]

>>> it = sumes_parcials(iter([10]*10000), iter([10000]))
>>> next(it) # doctesttag: +TAG=1_sumesp
100000
>>> next(it,'final') # doctesttag: +TAG=1_sumesp
'final'

>>> it = sumes_parcials(itertools.count(),itertools.count(1))
>>> for i in range(25): # doctesttag: +TAG=1_sumesp
...     print(next(it), end=',')
0,3,12,30,60,105,168,252,360,495,660,858,1092,1365,1680,2040,2448,2907,3420,3990,4620,5313,6072,6900,7800,

>>> from anterior import modifica

>>> itr = modifica(iter([3, 5, 2, 8]), [2, 4])
>>> list(itr) # doctesttag: +TAG=2_modifica
[12, 30]

>>> itr2 = modifica(iter([3, 5, 2, 8]), [1, 5])
>>> list(itr2) # doctesttag: +TAG=2_modifica
[12, 6, 72]

>>> itr2 = modifica(iter(range(20, 1, -2)), [5])
>>> list(itr2) # doctesttag: +TAG=2_modifica
[420, 342, 272, 210, 156, 110, 72, 42, 20, 6]

>>> itr2 = modifica(iter(range(30)), [0, 3, 4, 7])
>>> list(itr2) # doctesttag: +TAG=2_modifica
[2, 12, 20, 30, 42, 56, 90, 132, 182, 210, 240, 272, 306, 380, 462, 552, 600, 650, 702, 756, 870]

>>> itr2 = modifica(iter(range(50)), [0, 1, 2, 3, 4, 5, 6, 7, 8])
>>> list(itr2) # doctesttag: +TAG=2_modifica
[12, 56, 182, 306, 552, 756, 1122, 1406, 1892, 2256]

>>> itr2 = modifica(iter(range(5000)), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
>>> list(itr2) # doctesttag: +TAG=2_modifica
[]

>>> itr2 = modifica(iter(range(10)), [0,1,4,5,6,9])
>>> next(itr2,'final') # doctesttag: +TAG=2_modifica
'final'

>>> itr2 = modifica(iter(range(50)), [])
>>> list(itr2) == [0, 2, 6, 12, 20, 30, 42, 56, 72, 90, 110, 132, 156, 182, 210, 240, 272, 306, 342, 380, 420, 462, 506, 552, 600, 650, 702, 756, 812, 870, 930, 992, 1056, 1122, 1190, 1260, 1332, 1406, 1482, 1560, 1640, 1722, 1806, 1892, 1980, 2070, 2162, 2256, 2352, 2450] # doctesttag: +TAG=2_modifica
True

>>> itr2 = modifica(itertools.count(), [])
>>> for i in range(25): # doctesttag: +TAG=2_modifica
...     print (next(itr2),end=',')
0,2,6,12,20,30,42,56,72,90,110,132,156,182,210,240,272,306,342,380,420,462,506,552,600,