my_dict = { 'a': 5, 'b': 2 , 'c': 6, 'd': 1, 'e': 3, 'f': 4}
ret = sorted(my_dict,key=lambda x:my_dict[x], reverse=True)[0] print(ret)
ret = max(my_dict, key=lambda x:my_dict[x]) print(ret)