[Python] Tuple value by key

Is it possible to get Value out of tuple:

TUPLE = (
('P', 'Shtg1'),
('R', u'Shtg2'),
('D', 'Shtg3'),
)


by calling STR key like P

Python says that only int can be used for this type of 'query'

I can't use loop (too much overhead...)

Thank you!

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