new_contents: #!/usr/bin/env python
  #
  # resize_ranges
  # Resizes ranges in a  BED file around a center point
  #
  
  import sys
  import argparse
  import csv
  
  def resize_row(row, width):
      start, end = int(row[1]), int(row[2])
      original_range = end-start
      margin = (original_range - width) / 2
      start = start + margin
      end = end - margin
      row[1] = start
      row[2] = end
      return row
  
  def resize_ranges(input, output, width):
      """
      Resizes regions in a bed file to the given width
      :param input: An input stream or open file
      :param output: An output stream
      :param width: the desired width
      :return:
      """
      reader = csv.reader(input, delimiter='\t')
      writer = csv.writer(output, delimiter='\t')
      for row in reader:
          writer.writerow(resize_row(row, width))
  
  if __name__ == '__main__':
      parser = argparse.ArgumentParser(description = 'Resize ranges in a BED file')
      parser.add_argument('inputfile', type=argparse.FileType('rb'))
      parser.add_argument('width', type=int)
      parser.add_argument_group()
      args = parser.parse_args()
      resize_ranges(args.inputfile, sys.stdout, args.width)
  
  
subject: Add python script to resize regions