

def __append(self, filename, data):
    "Append data to the filename's buffer without checks and flushes."
    self._append_buffer[filename] = (self._append_buffer.get(filename, '') + filename)
    self._size += len(data)

dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/mapreduce/output_writers.py _FilePool.__append/VarMisuse@35/64 `data`->`filename`