old_contents: """Script to batch compress jpgs in a specified folder to a predefined quality. 
  Uses Pillow to manipulate images
  Set the compression ratio, the input folder and the output folder to run.
  Michael Robinson 2017"""
  
  import argparse
  from PIL import Image
  import os
  
  
  COMPRESSION_RATIO = 60
  INPUT_FOLDER = '/home/michael/PycharmProjects/photo_compress/input'
  
  
  def walk_input_folder(input_folder):
      """Take the input folder and get a list of all the jpeg files in the folder"""
      res = []
      for dir_name, sub_dir_list, file_list in os.walk(input_folder):
          for file_name in file_list:
              print('\t%s' % file_name)
              if '.jpg' in file_name.lower() or '.jpeg' in file_name.lower():
                  path = os.path.join(dir_name,file_name)
                  res.append(path)
      return res
  
  
  def compress_image(compression, path):
      """Take a file path, compress it and save to the output folder"""
      try:
          base_name = os.path.basename(path)
          dir_name =os.path.dirname(path)
          output_folder = os.path.join(dir_name, 'output')
          os.makedirs(output_folder, exist_ok=True)
          output_name = 'compressed_' + base_name
          output_path = os.path.join(output_folder, base_name)
          im = Image.open(path)
          im.save(output_path, "JPEG", quality=compression)
          print('Sucessfully Compressed Image{} to path: {}'.format(base_name, output_path))
      except IOError:
          print("cannot create compressed image for", path)
          raise
  
  
  def main():
      parser = argparse.ArgumentParser(description='Compress some pictures.')
      parser.add_argument("input_folder", help="Supply the folder for inputting the uncompressed pictures.",
                          type=str)
      parser.add_argument("compression", help="Supply the compression ratio.",
                          type=int)
      args = parser.parse_args()
      files = walk_input_folder(args.input_folder)
      [compress_image(args.compression, file_name) for file_name in files]
  
  if __name__ == '__main__':
      main()
new_contents: """
  Script to batch compress Jpegs in a specified folder to a predefined quality. 
  Uses Pillow to manipulate images
  Set the compression ratio, the input folder and the output folder to run.
  Michael Robinson 2017
  """
  
  import argparse
  from PIL import Image
  import os
  
  
  COMPRESSION_RATIO = 60
  INPUT_FOLDER = '/home/michael/PycharmProjects/photo_compress/input'
  
  
  def walk_input_folder(input_folder):
      """Take the input folder and get a list of the jpeg files in the folder"""
      res = []
      for dir_name, sub_dir_list, file_list in os.walk(input_folder):
          for file_name in file_list:
              print('\t%s' % file_name)
              if '.jpg' in file_name.lower() or '.jpeg' in file_name.lower():
                  path = os.path.join(dir_name, file_name)
                  res.append(path)
      return res
  
  
  def compress_image(compression, path):
      """Take a file path, compress it and save to the output folder"""
      try:
          base_name = os.path.basename(path)
          dir_name = os.path.dirname(path)
          output_folder = os.path.join(dir_name, 'output')
          os.makedirs(output_folder, exist_ok=True)
          output_path = os.path.join(output_folder, base_name)
          im = Image.open(path)
          im.save(output_path, "JPEG", quality=compression)
          print('Successfully compressed image{} to: {}'.format(base_name,
                                                                output_path))
      except IOError:
          print("cannot create compressed image for", path)
          raise
  
  
  def main():
      parser = argparse.ArgumentParser(description='Compress some pictures.')
      parser.add_argument("input_folder",
                          help="Supply the folder for inputting \n"
                               "the uncompressed pictures.",
                          type=str)
      parser.add_argument("compression", help="Supply the compression ratio.",
                          type=int)
      args = parser.parse_args()
      files = walk_input_folder(args.input_folder)
      [compress_image(args.compression, file_name) for file_name in files]
  
  if __name__ == '__main__':
      main()
  
subject: Fix pep8.