Class _WriteBufferStream

Lib/gzip.py:129–144

Minimal object to pass WriteBuffer flushes into GzipFile

class _WriteBufferStream(io.RawIOBase):
    """Minimal object to pass WriteBuffer flushes into GzipFile"""
    def __init__(self, gzip_file):
        self.gzip_file = weakref.ref(gzip_file)

    def write(self, data):
        gzip_file = self.gzip_file()
        if gzip_file is None:
            raise RuntimeError("lost gzip_file")
        return gzip_file._write_raw(data)

    def seekable(self):
        return False

    def writable(self):
        return True


class GzipFile(_streams.BaseStream):