Python alternative to using incremental counter?

Question

Consider the following code (It doesn't really matter what it's used for):

def zipstreams(filename):
    """Return all zip streams and their positions in file."""
    with open(filename, "rb") as fh:
        data = fh.read()
    i = 0
    while i < len(data):
        try:
            zo = zlib.decompressobj()
            yield i, zo.decompress(data[i:])
            i += len(data[i:]) - len(zo.unused_data)
        except zlib.error:
            i += 1

Is there a better way to do something like this without using the incremental counter 0? I'm going for compactness, and I was wondering if there's a better way to do this sort of thing, so I don't have to use a counter.