Coroutines and argument tupling

[Marshall T. Vandegrift]

"attn.steven.kuo at gmail.com" <attn.steven.kuo at gmail.com> writes:

> Do you really need a generator or co-routine to do this?  Maybe
> you can just use a closure:

For my trivial example, sure -- there are lots of ways to do it.  Here's
a slightly better example: the `read' method of a file-like object which
sequentially joins the contents of a sequence of other file-like
objects:

    @coroutine
    def read(self, size=-1):
        data = ''
        for file in self.files:
            this = file.read(size - len(data))
            data = ''.join([data, this])
            while this:
                if len(data) == size:
                    _, size = (yield data)
                    data = ''
                this = file.read(size - len(data))
                data = ''.join([data, this])
        yield data
        while True:
            yield ''

-Marshall