parameters: (scanner_class)
return_statement: return str(scanner_class) in __scanners
docstring: Returns true iff a scanner of that class is registered
docstring_summary: Returns true iff a scanner of that class is registered
docstring_tokens: Returns true iff a scanner of that class is registered
function: def registered(scanner_class):
      """ Returns true iff a scanner of that class is registered
      """
      return str(scanner_class) in __scanners
function_tokens: def registered ( scanner_class ) : return str ( scanner_class ) in __scanners