old_contents: #!/usr/bin/env python
  """
  File format converter.
  The script converts csv file to netcdf format.
  
  """
  
  import os.path
  import pupynere
  
  
  def new_name(old_name):
      '''Return filename with new ext nc'''
      return '.'.join([os.path.splitext(old_name)[0], 'nc'])
  
  
  def read_file(fl):
      '''Yields line by line
  
      :Args:
        - fl, csv file for transformation
  
      '''
      with open(fl, 'r') as f:
          for line in f:
              if not line.startswith('#'):
                  yield line.strip().split(',')
  
  
  def make_float(fl):
      '''Returns generator that yields csv lines with float numbers
  
      :Args:
       - fl, csv file for transformation
  
      '''
      return (item for item in zip(*[map(float, l) for l in read_file(fl)]))
  
  
  def transform(fl):
      """Transforms csv file into netcdf format.
  
      :Args:
        - fl, cvs data file, example: data.csv
  
      :Returns:
        - netcdf file, example: data.nc
  
      """
      nc = pupynere.netcdf_file(new_name(fl), 'w')
      nc.createDimension('dim', None)
  
      for i, item in enumerate(make_float(fl)):
          nc.createVariable('var_%02d' % i, 'd', ('dim',))[:] = item
  
  
  def main():
      import sys
      if len(sys.argv) < 2:
          sys.stderr.write("Usage: csvnc <csvfile>\n")
          raise SystemExit(1)
      if not os.path.exists(sys.argv[1]):
          sys.stderr.write("Error: csvdata file {0} not found\n".format(
              sys.argv[1]))
          raise SystemExit(1)
  
      transform(sys.argv[1])
  
  
  if __name__ == "__main__":
      main()
  
new_contents: #!/usr/bin/env python
  """
  File format converter.
  The script converts csv file to netcdf format.
  """
  
  import os.path
  import pupynere
  
  
  def new_name(old_name):
      '''Return filename with new ext nc'''
      return '.'.join([os.path.splitext(old_name)[0], 'nc'])
  
  
  def read_file(fl):
      '''Yields csv line
  
      :Args:
        - fl, csv file for transformation
  
      '''
      with open(fl, 'r') as f:
          for line in f:
              if not line.startswith('#'):
                  yield line.strip().split(',')
  
  
  def make_float(fl):
      '''Returns generator that yields csv lines with float numbers
  
      :Args:
       - fl, csv file for transformation
  
      '''
      return (item for item in zip(*[map(float, l) for l in read_file(fl)]))
  
  
  def transform(fl):
      """Transforms csv file into netcdf format.
  
      :Args:
        - fl, cvs data file, example: data.csv
  
      :Returns:
        - netcdf file, example: data.nc
  
      """
      nc = pupynere.netcdf_file(new_name(fl), 'w')
      nc.createDimension('dim', None)
  
      for i, item in enumerate(make_float(fl)):
          nc.createVariable('var_%02d' % i, 'd', ('dim',))[:] = item
  
  
  def main():
      import sys
      if len(sys.argv) < 2:
          sys.stderr.write("Usage: csvnc <csvfile>\n")
          raise SystemExit(1)
      if not os.path.exists(sys.argv[1]):
          sys.stderr.write("Error: csvdata file {0} not found\n".format(
              sys.argv[1]))
          raise SystemExit(1)
  
      transform(sys.argv[1])
  
  
  if __name__ == "__main__":
      main()
  
subject: fix docstring