old_contents: import os
  import json
  import sys
  
  def get_item(key):
      try:
          return json.loads(open(os.path.join(os.path.abspath(os.path.dirname(sys.argv[0])),key), "rb").read().decode('UTF-8'))["_"]
      except (IOError, ValueError):
          return None
  
  def set_item(key,value):
      open(os.path.join(os.path.abspath(os.path.dirname(sys.argv[0])),key), "wb").write(json.dumps({"_": value}).encode('UTF-8'))
      return value
  
  def delete_item(key):
  	if os.path.isfile(os.path.join(os.path.abspath(os.path.dirname(sys.argv[0])),key)):
  		os.remove(os.path.join(os.path.abspath(os.path.dirname(sys.argv[0])),key))
  
new_contents: import os
  import json
  import sys
  
  
  CURRENT_DIR = os.path.abspath(os.path.dirname(sys.argv[0]))
  
  
  def get_item(key):
      """Return content in cached file in JSON format"""
      CACHED_KEY_FILE = os.path.join(CURRENT_DIR, key)
  
      try:
          return json.loads(open(CACHED_KEY_FILE, "rb").read().decode('UTF-8'))["_"]
      except (IOError, ValueError):
          return None
  
  
  def set_item(key,value):
      """Write JSON content from value argument to cached file and return"""
      CACHED_KEY_FILE = os.path.join(CURRENT_DIR, key)
  
      open(CACHED_KEY_FILE, "wb").write(json.dumps({"_": value}).encode('UTF-8'))
  
      return value
  
  
  def delete_item(key):
      """Delete cached file if present"""
      CACHED_KEY_FILE = os.path.join(CURRENT_DIR, key)
  
      if os.path.isfile(CACHED_KEY_FILE):
          os.remove(CACHED_KEY_FILE)
  
  
subject: Add docstring to function and refactor some code for clarification