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python - subtracting dictionary values

d3 = {key: d1[key] - d2.get(key, 0) for key in d1}
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python - How to subtract values from dictionaries

>>> from collections import Counter
>>> d1 = Counter({'a': 10, 'b': 9, 'c': 8, 'd': 7})
>>> d2 = Counter({'a': 1, 'b': 2, 'c': 3, 'e': 2})
>>> d3 = d1 - d2
>>> print d3
Counter({'a': 9, 'b': 7, 'd': 7, 'c': 5})
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