[ python-Feature Requests-1757395 ] splice() function for itertools

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Feature Requests item #1757395, was opened at 2007-07-20 10:12
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Category: Python Library
Group: Python 2.6
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Alexander Dutton (asdutton)
Assigned to: Nobody/Anonymous (nobody)
Summary: splice() function for itertools

Initial Comment:
Could we have a splice function in itertools? I see there was once a roundrobin proposal (#756253), but it was three years ago ...

Here's an alternate implementation:

def splice(*args):
  """splice(*iterables) --> iterator
  Returns an iterator whose next() method returns an element from each of the iterables in turn before starting again with the first iterable."""
  iters = list(args)
  n = len(iters)
  i = 0
  while n>0:
    i %= n
    try:
      yield iters[i].next()
      i += 1
    except StopIteration, e:
      n -= 1
      iters[i:i+1] = []
  raise StopIteration

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=355470&aid=1757395&group_id=5470