diff options
| -rw-r--r-- | Lib/functools.py | 7 | ||||
| -rw-r--r-- | Lib/test/test_functools.py | 10 | ||||
| -rw-r--r-- | Misc/NEWS | 4 | ||||
| -rw-r--r-- | Modules/_functoolsmodule.c | 49 |
4 files changed, 35 insertions, 35 deletions
diff --git a/Lib/functools.py b/Lib/functools.py index 45e5f87ede..030c91b057 100644 --- a/Lib/functools.py +++ b/Lib/functools.py @@ -421,7 +421,7 @@ class _HashedSeq(list): def _make_key(args, kwds, typed, kwd_mark = (object(),), fasttypes = {int, str, frozenset, type(None)}, - sorted=sorted, tuple=tuple, type=type, len=len): + tuple=tuple, type=type, len=len): """Make a cache key from optionally typed positional and keyword arguments The key is constructed in a way that is flat as possible rather than @@ -434,14 +434,13 @@ def _make_key(args, kwds, typed, """ key = args if kwds: - sorted_items = sorted(kwds.items()) key += kwd_mark - for item in sorted_items: + for item in kwds.items(): key += item if typed: key += tuple(type(v) for v in args) if kwds: - key += tuple(type(v) for k, v in sorted_items) + key += tuple(type(v) for v in kwds.values()) elif len(key) == 1 and type(key[0]) in fasttypes: return key[0] return _HashedSeq(key) diff --git a/Lib/test/test_functools.py b/Lib/test/test_functools.py index 3a40861594..27eb57685a 100644 --- a/Lib/test/test_functools.py +++ b/Lib/test/test_functools.py @@ -1306,6 +1306,16 @@ class TestLRU: self.assertEqual(fib.cache_info(), self.module._CacheInfo(hits=0, misses=0, maxsize=None, currsize=0)) + def test_kwargs_order(self): + # PEP 468: Preserving Keyword Argument Order + @self.module.lru_cache(maxsize=10) + def f(**kwargs): + return list(kwargs.items()) + self.assertEqual(f(a=1, b=2), [('a', 1), ('b', 2)]) + self.assertEqual(f(b=2, a=1), [('b', 2), ('a', 1)]) + self.assertEqual(f.cache_info(), + self.module._CacheInfo(hits=0, misses=2, maxsize=10, currsize=2)) + def test_lru_cache_decoration(self): def f(zomg: 'zomg_annotation'): """f doc string""" @@ -47,6 +47,10 @@ Library - Issue #28961: Fix unittest.mock._Call helper: don't ignore the name parameter anymore. Patch written by Jiajun Huang. +- Issue #29203: functools.lru_cache() now respects PEP 468 and preserves + the order of keyword arguments. f(a=1, b=2) is now cached separately + from f(b=2, a=1) since both calls could potentially give different results. + - Issue #15812: inspect.getframeinfo() now correctly shows the first line of a context. Patch by Sam Breese. diff --git a/Modules/_functoolsmodule.c b/Modules/_functoolsmodule.c index 2269d05da8..ca61fcd8b0 100644 --- a/Modules/_functoolsmodule.c +++ b/Modules/_functoolsmodule.c @@ -704,8 +704,8 @@ static PyTypeObject lru_cache_type; static PyObject * lru_cache_make_key(PyObject *args, PyObject *kwds, int typed) { - PyObject *key, *sorted_items; - Py_ssize_t key_size, pos, key_pos; + PyObject *key, *keyword, *value; + Py_ssize_t key_size, pos, key_pos, kwds_size; /* short path, key will match args anyway, which is a tuple */ if (!typed && !kwds) { @@ -713,28 +713,18 @@ lru_cache_make_key(PyObject *args, PyObject *kwds, int typed) return args; } - if (kwds && PyDict_Size(kwds) > 0) { - sorted_items = PyDict_Items(kwds); - if (!sorted_items) - return NULL; - if (PyList_Sort(sorted_items) < 0) { - Py_DECREF(sorted_items); - return NULL; - } - } else - sorted_items = NULL; + kwds_size = kwds ? PyDict_Size(kwds) : 0; + assert(kwds_size >= 0); key_size = PyTuple_GET_SIZE(args); - if (sorted_items) - key_size += PyList_GET_SIZE(sorted_items); + if (kwds_size) + key_size += kwds_size * 2 + 1; if (typed) - key_size *= 2; - if (sorted_items) - key_size++; + key_size += PyTuple_GET_SIZE(args) + kwds_size; key = PyTuple_New(key_size); if (key == NULL) - goto done; + return NULL; key_pos = 0; for (pos = 0; pos < PyTuple_GET_SIZE(args); ++pos) { @@ -742,14 +732,16 @@ lru_cache_make_key(PyObject *args, PyObject *kwds, int typed) Py_INCREF(item); PyTuple_SET_ITEM(key, key_pos++, item); } - if (sorted_items) { + if (kwds_size) { Py_INCREF(kwd_mark); PyTuple_SET_ITEM(key, key_pos++, kwd_mark); - for (pos = 0; pos < PyList_GET_SIZE(sorted_items); ++pos) { - PyObject *item = PyList_GET_ITEM(sorted_items, pos); - Py_INCREF(item); - PyTuple_SET_ITEM(key, key_pos++, item); + for (pos = 0; PyDict_Next(kwds, &pos, &keyword, &value);) { + Py_INCREF(keyword); + PyTuple_SET_ITEM(key, key_pos++, keyword); + Py_INCREF(value); + PyTuple_SET_ITEM(key, key_pos++, value); } + assert(key_pos == PyTuple_GET_SIZE(args) + kwds_size * 2 + 1); } if (typed) { for (pos = 0; pos < PyTuple_GET_SIZE(args); ++pos) { @@ -757,20 +749,15 @@ lru_cache_make_key(PyObject *args, PyObject *kwds, int typed) Py_INCREF(item); PyTuple_SET_ITEM(key, key_pos++, item); } - if (sorted_items) { - for (pos = 0; pos < PyList_GET_SIZE(sorted_items); ++pos) { - PyObject *tp_items = PyList_GET_ITEM(sorted_items, pos); - PyObject *item = (PyObject *)Py_TYPE(PyTuple_GET_ITEM(tp_items, 1)); + if (kwds_size) { + for (pos = 0; PyDict_Next(kwds, &pos, &keyword, &value);) { + PyObject *item = (PyObject *)Py_TYPE(value); Py_INCREF(item); PyTuple_SET_ITEM(key, key_pos++, item); } } } assert(key_pos == key_size); - -done: - if (sorted_items) - Py_DECREF(sorted_items); return key; } |