code: def time_write_sequential(self, nunique):
      pq.write_table(self.table_sequential, pa.BufferOutputStream())
  
imports: import shutil
  import tempfile
  from pandas.util.testing import rands
  import numpy
  import pandas
  import pyarrow
label_desc: Use image node_id 3 for calling the ParquetWriteDictionaries obj's underlying member method code with example usage: obj.time_write_sequential(nunique) without return types