Adapt an iterator to behave like a file-like object in Python

Question

I have a generator producing a list of strings. Is there a utility/adapter in Python that could make it look like a file?

For example,

>>> d         


        

Answer 1

The problem with StringIO is that you have to load everything into the buffer up front. This can be a problem if the generator is infinite :)

from itertools import chain, islice
class some_magic_adaptor(object):
    def __init__(self, src):
        self.src = chain.from_iterable(src)
    def read(self, n):
        return "".join(islice(self.src, None, n))