How to get selection value translated in python code

_name = 'pos.session'

POS_SESSION_STATE = [
    ('opening_control', 'Opening Control'),
    ('opened', 'In Progress'),
    ('closing_control', 'Closing Control'),
    ('closed', 'Closed & Posted'),
]

state = fields.Selection(
    POS_SESSION_STATE, string='Status',
    required=True, readonly=True,
    index=True, copy=False, default='opening_control')

When I do a print in python code the state value returns me translated as the qweb reports
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