parameters: (rdtype)
return_statement: return False
docstring: True if the type is a singleton.
      @param rdtype: the type
      @type rdtype: int
      @rtype: bool
docstring_summary: True if the type is a singleton.
docstring_tokens: True if the type is a singleton .
function: def is_singleton(rdtype):
      """True if the type is a singleton.
      @param rdtype: the type
      @type rdtype: int
      @rtype: bool"""
  
      if _singletons.has_key(rdtype):
          return True
      return False
function_tokens: def is_singleton ( rdtype ) : if _singletons . has_key ( rdtype ) : return True return False