Re: On dirait du C

Piqué sur http://stackoverflow.com/questions/6822725/rolling-or-sliding-window-iterator-in-python

from itertools import islice
line="abcd\nefg"
def window(seq, n=2):
 "Returns a sliding window (of width n) over data from the iterable"
 " s -> (s0,s1,...s[n-1]), (s1,s2,...,sn), ... "
 it = iter(seq)
 result = tuple(islice(it, n))
 if len(result) == n:
 yield result 
 for elem in it:
 result = result[1:] + (elem,)
 yield result
for chunk in window(line, 2):
 print(chunk, ''.join(chunk))
for chunk in window(line, 3):
 print(chunk, ''.join(chunk))
 from itertools import islice

La sortie :

('a', 'b') ab
('b', 'c') bc
('c', 'd') cd
('d', '\n') d
('\n', 'e') 
e
('e', 'f') ef
('f', 'g') fg
('a', 'b', 'c') abc
('b', 'c', 'd') bcd
('c', 'd', '\n') cd
('d', '\n', 'e') d
e
('\n', 'e', 'f') 
ef
('e', 'f', 'g') efg