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something like:
 def write(self,data):
 self._check_closed()
 if self.mode != WRITE:
 import errno
 raise OSError(errno.EBADF, "write() on read-only GzipFile object")
 if self.fileobj is None:
 raise ValueError("write() on closed GzipFile object")
 if isinstance(data, bytes):
 length = len(data)
 elif isinstance(data, memoryview) and not data.c_contiguous:
 data = data.tobytes()
 length = len(data)
 else:
 # accept any data that supports the buffer protocol
 data = memoryview(data)
 length = data.nbytes
 if length > 0:
 self.fileobj.write(self.compress.compress(data))
 self.size += length
 self.crc = zlib.crc32(data, self.crc) & 0xffffffff
 self.offset += length
 return length