Q:

Combine two dictionaries with the same keys but different value types

I have two dictionaries, each with the same key, but different values. 
food = {'fruit' : 5, 'vegetable' : 2, 'dairy' : 1, 'meat' : 3, 'grain' : 1}

fav = { 'fruit' : ['apple', 'orange', 'banana', 'grape', 'plum'],
        'vegetable' : ['carrot', 'corn'],
        'dairy' : ['milk'],
        'meat' : ['chicken', 'egg', 'beef'],
        'grain' : ['bread']
      }

The result I'm looking to achieve will be something like this,
eats = { 'fruit' : 5, ['apple', 'orange', 'banana', 'grape', 'plum'], 
         'vegetable' : 2, ['carrot', 'corn'],
       ...

etc etc. 
***** EDIT ********
Also Some entries in each dictionary may be empty, for example 
food = {'fruit' : 5, 'vegetable' : 2, 'dairy' : 1, 'meat' : 3, 'grain' : 1, 'sweets' : 0}

Sweets is not in fav, so how can i combine these dictionaries keeping sweets, and not getting a key error? 

A:

You could use dict comprehension and tuples.  I think you couldn't get the output you expecting because it's not valid dict (with comma should be separated neihbor keys):
eats = {key : (food[key],fav[key]) for key in food}

print(eats)
{'dairy': (1, ['milk']),
 'fruit': (5, ['apple', 'orange', 'banana', 'grape', 'plum']),
 'grain': (1, ['bread']),
 'meat': (3, ['chicken', 'egg', 'beef']),
 'vegetable': (2, ['carrot', 'corn'])}

EDIT
For your edit you need to add check key in fav dict:
eats = {key : (food[key],fav[key]) for key in food if key in fav}

The result for your example is the same as posted.