python - get best match for django query -

i have 1 thing , need suggest. please me on this.

my scenario is: have 1 model ordercode in table have prefix

1  | 12 | canada 13 | uk 134 | australia  

and more. then, have string 12345678, , need best match string .

if user enter 12345678 best match 12|canada , if user enter 135678975 best match 13|uk, , if user enter 1345676788 best match 134.

how can in django query?

thanks,

it require multiple request check every char in given order code...

def get_matching_country(order_num):     = 1     matching_req = country.objects.none()     while true:         req = country.objects.filter(country_code=order_num[:i])         if res.exists():             matching_req = req             += 1         else:             break      return matching_req