text: import os
  import time
  
  
  def source_exist(dirpath):
      return os.path.exists(dirpath) and os.path.isdir(dirpath)
  
  
  def get_entries(dirpath, condition=None):
      if not os.path.exists(dirpath):
          print("Provided dirpath {} doesn't exist.".format(dirpath), flush=True)
          print('Waiting {} seconds...'.format(sleep), flush=True)
          return None
  
      if not os.path.isdir(dirpath):
          print("Provided dirpath {} is not directory.".format(dirpath), flush=True)
          print('Waiting {} seconds...'.format(sleep), flush=True)
          return None
  
      if not condition:
          condition = lambda a: True
  
      entries = os.listdir(dirpath)
      entries = sorted([f for f in entries if condition(dirpath, f)])
      entries_len = len(entries)
      print('Found {} entries.'.format(entries_len), flush=True)
      if entries_len == 0:
          print('Waiting {} seconds...'.format(sleep), flush=True)
          return None
  
      return entries
  
  
  # helper condition functions for get_entries
  
  
  def check_file(dirpath, item):
      return not item.startswith('.') and os.path.isfile(os.path.join(dirpath, item))
  
  
  def check_dir(dirpath, item):
      return not item.startswith('.') and os.path.isdir(os.path.join(dirpath, item))
  
  
  