why is self not passed to id()?

[Ruediger]

Hello!

Executing following little program gives me an TypeError.

What makes me wonder is that foo does get an argument passed while bar
doesn't. Can anyone explain why??????

Thanks
Ruediger



class foo(list):
    __hash__ = lambda x: id(x)

class bar(list):
    __hash__ = id

_s_ = set()
_s_.add(foo())
_s_.add(bar())

rue at linux:~> python test01.py
Traceback (most recent call last):
  File "test01.py", line 9, in <module>
    _s_.add(bar())
TypeError: id() takes exactly one argument (0 given)