How to Find Max Value in a Dictionary of Dictionaries and Turn it Into a Tuple?

I have a function nestedmax that has the following…

Parameters: A dictionary of dictionaries, and a string indicating the subfield we care about.
Returns: A tuple (x, y) where x = primary key, and y = max value in the subfield.

Sample input: {"1/3" : {"X" : 9}, "1/4" : {"X" : 12}}, "X"
Desired output: ("1/4", 12)

Sample input: {"1/1" : {"opponent": "BU", "X" : 4}, "1/2" : {"opponent": "HC", "X" : 3}}, "X"
Desired output: ("1/1", 4)

I currently have…

def nestedmax(input_dict, subfield):

  my_dict = input_dict.copy()
  for d in my_dict.values():
      for field in list(d.keys()):
          if field not in subfield:
              d.pop(field)
  return(my_dict)

But can’t seem to turn my output into a tuple like the desired output. Please help.

>Solution :

I rewrote it for you. This will work

def nextedmax(input_dict, subfield):
    ini, s = 0, {}
    for k,v in my_dict.items():
        x_i = v[subfield]
        if x_i > ini:
            ini = x_i
            s = (k, ini)
    return (s)