[TIP] Fixes for mock in Python 3

[Ian Cordasco]

On Fri, Sep 23, 2016 at 12:06 PM, Roy Williams <rwilliams at lyft.com> wrote:
> Hi all,
>
> I am investigating a migration to Python 3, and to facilitate this we are
> using the -3 flag as decribed here:
> https://docs.python.org/3/howto/pyporting.html#prevent-compatibility-regressions
> . When using this flag I encountered some issues inside of mock itself.
>
> Python 3 now requires you to implement `__hash__` if you implement `__eq__`.
> See
> https://docs.python.org/3.6/reference/datamodel.html#object.%5F%5Fhash%5F%5F
> .
>
> ```python
> {mock.ANY}  # Fine in Python 2, Throws in Python 3
> ```
>
> We need to explicitly sets the `__hash__` method on these objects as `None`
> to ensure the behavior is consistent in Python 3 as well as Python 2.
>
> I've put up a PR to fix this at
> https://github.com/testing-cabal/mock/pull/378 , but I am unsure if this is
> the correct source of truth for Mock.

This is the backport to Python 2.6+ from the head of Python
development. As I understand it, patches should go to bugs.python.org
first and then they will be backported to testing-cabal/mock on
GitHub.

Cheers,
Ian