import bz2
import shutil

class Compander(object):

    def __init__(self, uncompressed_name, compressed_name):
        self.uncompressed_name = uncompressed_name
        self.compressed_name = compressed_name

    def __enter__(self):
        return self

    def __exit__(self, type, value, traceback):
        pass

    def compress(self):
        with bz2.BZ2File(self.compressed_name, 'wb', compresslevel=9) as output:
            with open(self.uncompressed_name, 'rb') as input:
                shutil.copyfileobj(input, output)

    def uncompress(self):
        with bz2.BZ2File(self.compressed_name, 'rb', compresslevel=9) as input:
            with open(self.uncompressed_name, 'wb') as output:
                shutil.copyfileobj(input, output)