docs: def dump_dict(dict_input, indent=4):
      """
      辞書型変数を文字列に変換して返す
      """
  
      dict_work = dict(dict_input)
      """
      for key, value in six.iteritems(dict_input):
          if any([f(value) for f in (is_float, isDict, is_list_or_tuple)]):
              dict_work[key] = value
              continue
  
          try:
              dict_work[key] = str(value)
          except:
              dict_work[key] = str(type(value))
  
          dict_work[key] = _convert_dump_dict(value)
      """
  
      try:
          import json
          return json.dumps(dict_work, sort_keys=True, indent=indent)
      except ImportError:
          pass
  
      try:
          import simplejson as json
          return json.dumps(dict_work, sort_keys=True, indent=indent)
      except ImportError:
          pass
  
      try:
          import pprint
          return pprint.pformat(dict_work, indent=indent)
      except ImportError:
          pass
  
      return str(dict_work)