iterblocks cookbook example

[Steve Howell]

George Sakkis produced the following cookbook recipe,
which addresses a common problem that comes up on this
mailing list:

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/521877


I would propose adding something like this to the
cookbook example above.

def iterblocks2(lst, start_delim):
    # This variation on iterblocks shows a more
typical
    # implementation that behaves like iterblocks for
    # the Hello World example.  The problem with this
naive
    # implementation is that you cannot pass arbitrary
    # iterators.
    blocks = []
    new_block = []
    for item in lst:
        if start_delim(item):
            if new_block: blocks.append(new_block)
            new_block = []
        else:
            new_block.append(item)
    if new_block: blocks.append(new_block)
    return blocks

Comments welcome.  This has been tested on George's
slow-version-of-string-split example.  It treates the
delimiter as not being part of the block, and it punts
on the issue of what to do when you have empty blocks
(i.e. consecutive delimiters).






       
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