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Diffstat (limited to 'Misc/NEWS')
| -rw-r--r-- | Misc/NEWS | 10 |
1 files changed, 10 insertions, 0 deletions
@@ -23,6 +23,16 @@ Core usually for the better, but may also cause numerically unstable algorithms to break. +- The implementation of dicts suffers fewer collisions, which has speed + benefits. However, the order in which dict entries appear in dict.keys(), + dict.values() and dict.items() may differ from previous releases for a + given dict. Nothing is defined about this order, so no program should + rely on it. Nevertheless, it's easy to write test cases that rely on the + order by accident, typically because of printing the str() or repr() of a + dict to an "expected results" file. See Lib/test/test_support.py's new + sortdict(dict) function for a simple way to display a dict in sorted + order. + - Dictionary objects now support the "in" operator: "x in dict" means the same as dict.has_key(x). |