Recipe 577309 revision 2

from itertools import cycle
from collections import deque

def roundrobin(*iterables):
    q = deque(iter(it) for it in iterables)
    for itr in cycle(q):
        try:
            yield itr.next()
        except StopIteration:
            if len(q) > 0:
                q.pop()
            else:
                break

# EXAMPLE

for letter in roundrobin('ABC', 'DE', 'FGH'):
    print letter

# prints 'A', 'D', 'F', 'B', 'E', 'G', 'C', 'H'

--- revision 1 2010-07-16 14:20:29
+++ revision 2 2010-07-19 13:53:41
@@ -17,4 +17,4 @@
 for letter in roundrobin('ABC', 'DE', 'FGH'):
     print letter
 
-# prints 'A', 'D', 'F', 'B', 'E', 'G', 'C'
+# prints 'A', 'D', 'F', 'B', 'E', 'G', 'C', 'H'

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History

• revision 2 (13 years ago)
• revision 1 (13 years ago)