import gzip, bz2

def myopen(filename, mode="r", bufsize=-1):
    """
    open(), detecting .gz and .bz2 file suffixes
    """
    if filename[-3:] == ".gz":
        return gzip.open(filename, mode, bufsize)
    elif filename[-4:] == ".bz2":
        return bz2.open(filename, mode, bufsize)
    else:
        return open(filename, mode, bufsize)