Planning a Python Course for Beginners

[Marko Rauhamaa]

ram at zedat.fu-berlin.de (Stefan Ram):

> Steve D'Aprano <steve+python at pearwood.info> writes:
>>There's a word for frozen list: "tuple".
>
>   Yes, but one should not forget that a tuple
>   can contain mutable entries (such as lists).

Not when used as keys:

    >>> hash(([], []))
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    TypeError: unhashable type: 'list'


Marko