>>> from should_dsl import *

>>> 1 |should_be.into| [1,2,3]
True
>>> 1 |should_not_be.into| [1,2,3]
Traceback (most recent call last):
    ...
ShouldNotSatisfied: 1 is into [1, 2, 3]

>>> 5 |should_not_be.into| [1,2,3]
True

>>> 1 |should_be.into| [2]
Traceback (most recent call last):
    ...
ShouldNotSatisfied: 1 is not into [2]
