Wrapper to write to multiple streams

Question

In python, is there an easy way to set up a file-like object for writing that is actually backed by multiple output streams? For instance, I want something like this:

file1 = open("file1.txt", "w")
file2 = open("file2.txt", "w")
ostream = OStreamWrapper(file1, file2, sys.stdout)

#Write to both files and stdout at once:
ostream.write("ECHO!")

So what I'm looking for is OStreamWrapper. I know it'd be pretty easy to write my own, but if there's an existing one, I'd rather use that and not have to worry about finding and covering edge cases.

Answer 1

class OStreamWrapper(object):

    def __init__(self, *streams):
        self.streams = list(streams)

    def write(self, string):
        for stream in self.streams:
            stream.write(string)

    def writelines(self, lines):
        # If you want to use stream.writelines(), you have
        # to convert lines into a list/tuple as it could be
        # a generator.
        for line in lines:
            for stream in self.streams:
                stream.write(line)

    def flush(self):
        for stream in self.streams:
            stream.flush()