class MyWriter:

    def __init__(self, stdout):
        self.stdout = stdout
        self.dumps = []

    def write(self, text):
        self.stdout.write(smart_unicode(text).encode('cp1251'))
        self.dumps.append(text)

    def close(self):
        self.stdout.close()   

writer = MyWriter(sys.stdout)
save = sys.stdout
sys.stdout = writer 

I use self.dumps list to store geted data from prints. Is it exists more convinient object for storing string lines in memory? ideally i want dump it to one big string. I can get it like this "\n".join(self.dumps) from code above. Mb it's better to just concat strings - self.dumps += text ?