Hello Odoo Community,
I got a issue i was trying to return the results, the strange thing is on the log i can see corrent value Result 58.77 but if i add return the same value it get

new_values = dict(values)

ValueError: dictionary update sequence element #0 has length 1; 2 is required

If i add        

return {'distance':("%.2f" % round(distance,2))}

I get error:

vals[f] = res2[vals['id']]

KeyError: 276

My code:

class launch_map(osv.osv):

_inherit = "res.partner" 

def open_map2(self, cr, uid, ids, R, lat1, lon1, context=None):

R = 3961.0

partner = self.browse(cr, uid, ids[0], context=context)

lat2 = radians(partner.partner_latitude)

lon2 = radians(partner.partner_longitude)

lat1 = radians(51.749204)

lon1 = radians(-1.258504)

dlon = lon2 - lon1

dlat = lat2 - lat1

a = (sin(dlat/2))**2 + cos(lat1) * cos(lat2) * (sin(dlon/2))**2

c = 2 * atan2(sqrt(a), sqrt(1-a))

distance = R * c

print partner.partner_latitude

print partner.partner_longitude

print "Result", distance

print ("%.2f" % round(distance,2))

return ("%.2f" % round(distance,2))

Any examples and assistance would be appreaciated

Thank you,