In python 2.7 a module can't be used as a context manager.

For example, given the module, t.py:

    def __enter__(*args):
        print 'enter', args

    def __exit__(*args):
        print 'exit', args

In Python 2.6:

    >>> import t
    >>> with t: pass
    ... 
    enter ()
    exit (None, None, None)

In Python 2.7:

    >>> import t
    >>> with t: pass
    ... 
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    AttributeError: __exit__

IIUC, magic methods are looked up on the object’s class, not in the object’s __dict__. This behavior in 2.6 seems like a bug to me.

I-tried-to-add-__call__-to-a-module-once-ly yours

Confirmed: http://docs.python.org/reference/datamodel#specialnames
Closing. Sorry! (BTW, using import hackery and a custom module type, you could achieve your goal.)

Just for the record, this changed with the introduction of the SETUP_WITH opcode in r72912.  Perhaps Benjamin can confirm that the behaviour change was deliberate?

Yes, definitely.

On Sat, Jul 10, 2010 at 4:08 PM, Éric Araujo <report@bugs.python.org> wrote:
>
> Éric Araujo <merwok@netwok.org> added the comment:
>
> Confirmed: http://docs.python.org/reference/datamodel#specialnames
> Closing. Sorry! (BTW, using import hackery and a custom module type, you could achieve your goal.)

Yes, I'll have to use a custom module type and import hackery to get
code that worked before working again in Python 2.7.

Jim