io.py 文件源码

def __init__(self, path=None, mode='wt', use_gzip=False):
        self.mode = mode
        if path is None:
            self.name = "stdout"
            if 'b' in mode:
                self.fd = os.fdopen(sys.stdout.fileno(), 'wb')
            else:
                self.fd = sys.stdout
        else:
            self.name = os.path.basename(path)
            abspath = os.path.abspath(path)
            if not os.path.exists(os.path.dirname(abspath)):
                os.makedirs(os.path.dirname(abspath))
            if use_gzip:
                _open = lambda p, m: io.BufferedWriter(gzip.open(p, m))
            else:
                _open = lambda p, m: io.open(p, m)
            self.fd = _open(abspath, mode)