For objects with __dict__ vars() returns modifiable dict:
>>> class A():
... pass
...
>>> a = A()
>>> a.x = 42
>>> vars(a)
{'x': 42}
>>> vars(a)['x'] = 43
>>> vars(a)['y'] = 44
>>> a.x, a.y, vars(a)
(43, 44, {'y': 44, 'x': 43})
For globals vars() returns modifiable dict:
>>> x = 42
>>> vars()['x']
42
>>> vars()['x'] = 43
>>> vars()['y'] = 44
>>> vars()['x'], vars()['y']
(43, 44)
For locals vars() returns... hmm, partially modifiable dict:
>>> def f():
... x = 42
... print(vars())
... vars()['x'] = 43
... vars()['y'] = 44
... print(x, vars())
...
>>> f()
{'x': 42}
42 {'y': 44, 'x': 42}
Should behavior of vars() be corrected for locals?
Should vars() for objects with __slots__ [1] returns modifiable or
non-modifiable dict?
[1] http://bugs.python.org/issue13290
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