Created
May 10, 2011 18:10
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Reversing a Dictionary
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| def create_rdict(d): | |
| """ | |
| Return a dictionary with each value mapping to a set of keys. | |
| """ | |
| rd = {} | |
| for (key,value) in d.items(): | |
| v = rd.setdefault(value, set([])) | |
| v.add(key) | |
| return rd |
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