Calculate difference between two datetimes odoo 10 [duplicate]

Try with this example:

from dateutil.relativedelta import relativedelta

@api.one 
@api.depends('start_field','finish_field')
def _total_minutes(self):
    if self.start_field and self.finish_field:
        start_dt = fields.Datetime.from_string(self.start_field)
        finish_dt = fields.Datetime.from_string(self.finish_field)
        difference = relativedelta(finish_dt, start_dt)
        days = difference.days
        hours = difference.hours
        minutes = difference.minutes
        seconds = 0

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