Loop through dictionary with a math function
<p>I have this dictionary in which in which (key1, key2): value</p>

<pre><code>dict = {('1', '4'): 'A', ('3', '8'): 'B', ('4', '7'): 'C', 
('8', '9'): 'D', ('4', '2'): 'E', ('2', '0'): 'F', ('3', '9'): 
'G', ('7', '7'): 'H', ('8', '6'): 'I', ('5', '3'): 'J', 
('6', '1'): 'K'}

key1 = input('enter value of key1: ')
key2 = input('enter value of key2: ')
</code></pre>

<p>If I input a pair of key1, key2 and the pair doesn't exist, is there any way that I can loop through this dictionary and pass a math function i.e. to find average value for each pair of keys and print the one that has the biggest average value? </p>

<p>Edit: Actually this dictionary was derived from a text file, so it has to be in string first and I need to convert it to int but I don't know how.</p>
