input: from typing import Dict
  
  def read_data_from_json(filename: str) -> Dict:
      """
      Read the contents of a JSON file into a dictionary. If an error occurs,
      a suitable error message is printed.
      
      >>> read_data_from_json('valid_file.json')
      Expected output which represents the content of 'valid_file.json'
      
      >>> read_data_from_json('file_not_exists.json')
      The file specified does not exist.
      
      >>> read_data_from_json('invalid_json_format.json')
      The file specified is not in a valid JSON format.
      """
output:     import json
      import os
  
      if not os.path.exists(filename):
          print("The file specified does not exist.")
          return {}
  
      try:
          with open(filename, 'r') as file:
              data = json.load(file)
              return data
      except json.JSONDecodeError:
          print("The file specified is not in a valid JSON format.")
          return {}