def import_json():
global _json_module<EOL>if _json_module is not None:<EOL><INDENT>return _json_module<EOL><DEDENT>else:<EOL><INDENT>try:<EOL><INDENT>module = __import__('<STR_LIT>')<EOL><DEDENT>except ImportError: <EOL><INDENT>raise ImportError('<STR_LIT>')<EOL><DEDENT>else:<EOL><INDENT>_json_module = module<EOL>return module<EOL><DEDENT><DEDENT>
<Purpose>
  Tries to import json module. We used to fall back to the simplejson module,
  but we have dropped support for that module. We are keeping this interface
  intact for backwards compatibility.

<Arguments>
  None.

<Exceptions>
  ImportError: on failure to import the json module.

<Side Effects>
  None.

<Return>
  json module