gistfile1.py

>>> d = {'a': 'foo', 'b': 'bar'}
>>> d
{'a': 'foo', 'b': 'bar'}

# get name of matching prop
>>> matches = [item for item in d if d[item] =='bar']
>>> matches
['b']

# or, get the value of the match
>>> matches = [d[item] for item in d if d[item] =='bar']
>>> matches
['bar']

# or, pair
matches = [(item,d[item]) for item in d if d[item] =='bar']
>>> matches
[('b', 'bar')]