We have implemented the context manager API for connections and cursors in our mxODBC module and this works fine in Python 2.6.

In Python 2.7 we get the following error:

Traceback (most recent call last):
  File "context-manager.py", line 6, in <module>
    with db.cursor() as cursor:
AttributeError: __exit__

Here's the code snippet:

import mx.ODBC.unixODBC as ODBC
connectionString = '...'
db = ODBC.DriverConnect(connectionString)
with db.cursor() as cursor:
    print cursor

The mxODBC cursor is not an instance, it's implemented as Python type in C. It implements the tp_getattr slot, but not the tp_desc_get slot.

Looking at the apparently new API _PyObject_LookupSpecial(), this does not appear to support the tp_getattr slot and goes straight for the tp_desc_get slot.