title: Writing Dask partitions into single file
body: <p>New to <code>dask</code>,I have a <code>1GB</code> CSV file when I read it in <code>dask</code> dataframe it creates around 50 partitions after my changes in the file when I write, it creates as many files as partitions.<br>
  <strong>Is there a way to write all partitions to single CSV file and is there a way access partitions?</strong><br>
  Thank you.</p>