If you want to Computed fields in OpenERP(Odoo) follow the below mentioned code and paste it in your (Python).py file:

upper = fields.Char(compute='_compute_upper',
                    inverse='_inverse_upper',
                    search='_search_upper')

@api.depends('name')
def _compute_upper(self):
    for rec in self:
        rec.upper = rec.name.upper() if rec.name else False

def _inverse_upper(self):
    for rec in self:
        rec.name = rec.upper.lower() if rec.upper else False

def _search_upper(self, operator, value):
    if operator == 'like':
        operator = 'ilike'
    return [('name', operator, value)]
Note- Above code are compute, inverse and search are model methods.

Hope this will help you :)