only_choice

only_choice

from utils import *

def only_choice(values):
    for unit in unitlist:
        for box in unitlist:
            val = ''
            for item in box:
                if len(values[item]) > 1:
                    val += values[item]
            s = ''
            for v in val:
                if val.count(v) == 1:
                    s = v
                    break
            if s!='' and len(s) == 1:
                for item in box:
                    if s in values[item] and len(values[item]) > 1:
                        values[item] = s
                        break
    return values