python - How do I retrieve key from value in django choices field? -

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the sample code below:

refund_status = (     ('s', 'success'),     ('f', 'fail') ) refund_status = models.charfield(max_length=3, choices=refund_status)

i know in model can retrieve success method get_refund_status_display() method. however, if want reversely like: have 'success' want find abbreviated form 's'. how can in django or python?

i write that:

next(iter([x[0] x in refund_status if 'success' in x]), none)

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