[docs] (no subject)

[INADA Naoki]

http://docs.python.org/3.3/library/unittest.mock.html#magic-mock

> The two equality method, __eq__ and __ne__, are special. They do the
default equality comparison on identity, using a side effect, unless you
change their return value to return something else:

What "using a side effect" means?

-- 
INADA Naoki  <songofacandy at gmail.com>
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