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@@ -2262,6 +2262,18 b' class abstractsmartset(object):' | |||
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2262 | 2262 | raise ValueError('arg is an empty sequence') |
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2263 | 2263 | return max(self) |
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2264 | 2264 | |
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2265 | def first(self): | |
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2266 | """return the first element in the set (user iteration perspective) | |
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2267 | ||
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2268 | Return None if the set is empty""" | |
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2269 | raise NotImplementedError() | |
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2270 | ||
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2271 | def last(self): | |
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2272 | """return the last element in the set (user iteration perspective) | |
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2273 | ||
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2274 | Return None if the set is empty""" | |
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2275 | raise NotImplementedError() | |
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2276 | ||
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2265 | 2277 | def reverse(self): |
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2266 | 2278 | """reverse the expected iteration order""" |
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2267 | 2279 | raise NotImplementedError() |
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