title: Python: AttributeError: 'set' object has no attribute 'format'
body: <p>i am trying out the code below and the attribute error popped up. I am new to Python and would appreciate to know what I can do to correct this error. </p>
  
  <pre><code>    with open(csv_file_path,'wb+') as fout:
              csv_file = csv.writer(fout)
              csv_file.writerow(list(column_names))
              with open(json_file_path) as fin:
                  for line in fin:
                      line_contents = json.loads(line)
                      csv_file.writerow(get_row(line_contents,column_names))
  
      read_and_write_file(json_file,csv_file,column_names)
  
      if isinstance(line_value,unicode):
                  row.append({0}.format(line_value.encode('utf-8')))
  
  Traceback (most recent call last):
    File "Json_convert.py", line 89, in &lt;module&gt;
      read_and_write_file(json_file, csv_file, column_names)
    File "Json_convert.py", line 19, in read_and_write_file
      csv_file.writerow(get_row(line_contents,column_names))
    File "Json_convert.py", line 62, in get_row
      row.append({0}.format(line_value.encode('utf-8')))
  AttributeError: 'set' object has no attribute 'format'
  </code></pre>