Issue #14386: Expose the dict_proxy internal type as types.MappingProxyType
This commit is contained in:
Victor Stinner
parent
8a1d04c643
commit
0db176f8f6
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@ -36,11 +36,11 @@ Dictionary Objects
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Return a new empty dictionary, or *NULL* on failure.
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.. c:function:: PyObject* PyDictProxy_New(PyObject *dict)
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.. c:function:: PyObject* PyDictProxy_New(PyObject *mapping)
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Return a proxy object for a mapping which enforces read-only behavior.
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This is normally used to create a proxy to prevent modification of the
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dictionary for non-dynamic class types.
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Return a :class:`types.MappingProxyType` object for a mapping which
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enforces read-only behavior. This is normally used to create a view to
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prevent modification of the dictionary for non-dynamic class types.
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.. c:function:: void PyDict_Clear(PyObject *p)
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@ -2258,13 +2258,13 @@ pairs within braces, for example: ``{'jack': 4098, 'sjoerd': 4127}`` or ``{4098:
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.. method:: items()
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Return a new view of the dictionary's items (``(key, value)`` pairs). See
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below for documentation of view objects.
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Return a new view of the dictionary's items (``(key, value)`` pairs).
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See the :ref:`documentation of view objects <dict-views>`.
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.. method:: keys()
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Return a new view of the dictionary's keys. See below for documentation of
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view objects.
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Return a new view of the dictionary's keys. See the :ref:`documentation
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of view objects <dict-views>`.
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.. method:: pop(key[, default])
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@ -2298,8 +2298,12 @@ pairs within braces, for example: ``{'jack': 4098, 'sjoerd': 4127}`` or ``{4098:
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.. method:: values()
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Return a new view of the dictionary's values. See below for documentation of
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view objects.
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Return a new view of the dictionary's values. See the
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:ref:`documentation of view objects <dict-views>`.
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.. seealso::
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:class:`types.MappingProxyType` can be used to create a read-only view
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of a :class:`dict`.
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.. _dict-views:
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@ -85,3 +85,55 @@ The module defines the following names:
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In other implementations of Python, this type may be identical to
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``GetSetDescriptorType``.
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.. class:: MappingProxyType(mapping)
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Read-only proxy of a mapping. It provides a dynamic view on the mapping's
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entries, which means that when the mapping changes, the view reflects these
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changes.
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.. versionadded:: 3.3
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.. describe:: key in proxy
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Return ``True`` if the underlying mapping has a key *key*, else
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``False``.
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.. describe:: proxy[key]
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Return the item of the underlying mapping with key *key*. Raises a
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:exc:`KeyError` if *key* is not in the underlying mapping.
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.. describe:: iter(proxy)
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Return an iterator over the keys of the underlying mapping. This is a
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shortcut for ``iter(proxy.keys())``.
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.. describe:: len(proxy)
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Return the number of items in the underlying mapping.
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.. method:: copy()
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Return a shallow copy of the underlying mapping.
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.. method:: get(key[, default])
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Return the value for *key* if *key* is in the underlying mapping, else
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*default*. If *default* is not given, it defaults to ``None``, so that
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this method never raises a :exc:`KeyError`.
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.. method:: items()
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Return a new view of the underlying mapping's items (``(key, value)``
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pairs).
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.. method:: keys()
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Return a new view of the underlying mapping's keys.
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.. method:: values()
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Return a new view of the underlying mapping's values.
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@ -1068,6 +1068,13 @@ The :mod:`time` module has new functions:
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(Contributed by Victor Stinner in :issue:`10278`)
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types
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-----
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Add a new :class:`types.MappingProxyType` class: Read-only proxy of a mapping.
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(:issue:`14386`)
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urllib
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------
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@ -4574,11 +4574,11 @@ class DictProxyTests(unittest.TestCase):
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self.assertEqual(type(C.__dict__), type(B.__dict__))
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def test_repr(self):
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# Testing dict_proxy.__repr__.
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# Testing mappingproxy.__repr__.
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# We can't blindly compare with the repr of another dict as ordering
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# of keys and values is arbitrary and may differ.
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r = repr(self.C.__dict__)
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self.assertTrue(r.startswith('dict_proxy('), r)
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self.assertTrue(r.startswith('mappingproxy('), r)
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self.assertTrue(r.endswith(')'), r)
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for k, v in self.C.__dict__.items():
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self.assertIn('{!r}: {!r}'.format(k, v), r)
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@ -1,9 +1,11 @@
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# Python test set -- part 6, built-in types
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from test.support import run_unittest, run_with_locale
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import unittest
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import sys
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import collections
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import locale
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import sys
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import types
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import unittest
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class TypesTests(unittest.TestCase):
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@ -569,8 +571,184 @@ class TypesTests(unittest.TestCase):
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self.assertGreater(tuple.__itemsize__, 0)
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class MappingProxyTests(unittest.TestCase):
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mappingproxy = types.MappingProxyType
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def test_constructor(self):
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class userdict(dict):
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pass
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mapping = {'x': 1, 'y': 2}
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self.assertEqual(self.mappingproxy(mapping), mapping)
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mapping = userdict(x=1, y=2)
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self.assertEqual(self.mappingproxy(mapping), mapping)
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mapping = collections.ChainMap({'x': 1}, {'y': 2})
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self.assertEqual(self.mappingproxy(mapping), mapping)
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self.assertRaises(TypeError, self.mappingproxy, 10)
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self.assertRaises(TypeError, self.mappingproxy, ("a", "tuple"))
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self.assertRaises(TypeError, self.mappingproxy, ["a", "list"])
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def test_methods(self):
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attrs = set(dir(self.mappingproxy({}))) - set(dir(object()))
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self.assertEqual(attrs, {
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'__contains__',
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'__getitem__',
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'__iter__',
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'__len__',
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'copy',
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'get',
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'items',
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'keys',
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'values',
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})
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def test_get(self):
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view = self.mappingproxy({'a': 'A', 'b': 'B'})
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self.assertEqual(view['a'], 'A')
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self.assertEqual(view['b'], 'B')
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self.assertRaises(KeyError, view.__getitem__, 'xxx')
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self.assertEqual(view.get('a'), 'A')
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self.assertIsNone(view.get('xxx'))
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self.assertEqual(view.get('xxx', 42), 42)
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def test_missing(self):
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class dictmissing(dict):
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def __missing__(self, key):
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return "missing=%s" % key
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view = self.mappingproxy(dictmissing(x=1))
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self.assertEqual(view['x'], 1)
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self.assertEqual(view['y'], 'missing=y')
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self.assertEqual(view.get('x'), 1)
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self.assertEqual(view.get('y'), None)
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self.assertEqual(view.get('y', 42), 42)
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self.assertTrue('x' in view)
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self.assertFalse('y' in view)
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def test_customdict(self):
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class customdict(dict):
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def __contains__(self, key):
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if key == 'magic':
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return True
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else:
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return dict.__contains__(self, key)
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def __iter__(self):
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return iter(('iter',))
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def __len__(self):
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return 500
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def copy(self):
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return 'copy'
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def keys(self):
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return 'keys'
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def items(self):
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return 'items'
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def values(self):
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return 'values'
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def __getitem__(self, key):
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return "getitem=%s" % dict.__getitem__(self, key)
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def get(self, key, default=None):
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return "get=%s" % dict.get(self, key, 'default=%r' % default)
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custom = customdict({'key': 'value'})
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view = self.mappingproxy(custom)
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self.assertTrue('key' in view)
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self.assertTrue('magic' in view)
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self.assertFalse('xxx' in view)
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self.assertEqual(view['key'], 'getitem=value')
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self.assertRaises(KeyError, view.__getitem__, 'xxx')
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self.assertEqual(tuple(view), ('iter',))
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self.assertEqual(len(view), 500)
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self.assertEqual(view.copy(), 'copy')
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self.assertEqual(view.get('key'), 'get=value')
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self.assertEqual(view.get('xxx'), 'get=default=None')
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self.assertEqual(view.items(), 'items')
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self.assertEqual(view.keys(), 'keys')
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self.assertEqual(view.values(), 'values')
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def test_chainmap(self):
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d1 = {'x': 1}
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d2 = {'y': 2}
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mapping = collections.ChainMap(d1, d2)
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view = self.mappingproxy(mapping)
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self.assertTrue('x' in view)
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self.assertTrue('y' in view)
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self.assertFalse('z' in view)
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self.assertEqual(view['x'], 1)
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self.assertEqual(view['y'], 2)
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self.assertRaises(KeyError, view.__getitem__, 'z')
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self.assertEqual(tuple(sorted(view)), ('x', 'y'))
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self.assertEqual(len(view), 2)
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copy = view.copy()
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self.assertIsNot(copy, mapping)
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self.assertIsInstance(copy, collections.ChainMap)
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self.assertEqual(copy, mapping)
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self.assertEqual(view.get('x'), 1)
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self.assertEqual(view.get('y'), 2)
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self.assertIsNone(view.get('z'))
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self.assertEqual(tuple(sorted(view.items())), (('x', 1), ('y', 2)))
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self.assertEqual(tuple(sorted(view.keys())), ('x', 'y'))
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self.assertEqual(tuple(sorted(view.values())), (1, 2))
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def test_contains(self):
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view = self.mappingproxy(dict.fromkeys('abc'))
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self.assertTrue('a' in view)
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self.assertTrue('b' in view)
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self.assertTrue('c' in view)
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self.assertFalse('xxx' in view)
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def test_views(self):
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mapping = {}
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view = self.mappingproxy(mapping)
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keys = view.keys()
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values = view.values()
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items = view.items()
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self.assertEqual(list(keys), [])
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self.assertEqual(list(values), [])
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self.assertEqual(list(items), [])
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mapping['key'] = 'value'
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self.assertEqual(list(keys), ['key'])
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self.assertEqual(list(values), ['value'])
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self.assertEqual(list(items), [('key', 'value')])
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def test_len(self):
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for expected in range(6):
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data = dict.fromkeys('abcde'[:expected])
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self.assertEqual(len(data), expected)
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view = self.mappingproxy(data)
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self.assertEqual(len(view), expected)
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def test_iterators(self):
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keys = ('x', 'y')
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values = (1, 2)
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items = tuple(zip(keys, values))
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view = self.mappingproxy(dict(items))
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self.assertEqual(set(view), set(keys))
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self.assertEqual(set(view.keys()), set(keys))
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self.assertEqual(set(view.values()), set(values))
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self.assertEqual(set(view.items()), set(items))
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def test_copy(self):
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original = {'key1': 27, 'key2': 51, 'key3': 93}
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view = self.mappingproxy(original)
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copy = view.copy()
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self.assertEqual(type(copy), dict)
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self.assertEqual(copy, original)
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original['key1'] = 70
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self.assertEqual(view['key1'], 70)
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self.assertEqual(copy['key1'], 27)
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def test_main():
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run_unittest(TypesTests)
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run_unittest(TypesTests, MappingProxyTests)
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if __name__ == '__main__':
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test_main()
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@ -12,6 +12,7 @@ def _f(): pass
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FunctionType = type(_f)
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LambdaType = type(lambda: None) # Same as FunctionType
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CodeType = type(_f.__code__)
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MappingProxyType = type(type.__dict__)
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def _g():
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yield 1
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@ -32,6 +32,8 @@ Core and Builtins
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Library
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-------
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- Issue #14386: Expose the dict_proxy internal type as types.MappingProxyType.
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- Issue #13959: Make imp.reload() always use a module's __loader__ to perform
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the reload.
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@ -698,41 +698,44 @@ PyDescr_NewWrapper(PyTypeObject *type, struct wrapperbase *base, void *wrapped)
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}
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/* --- Readonly proxy for dictionaries (actually any mapping) --- */
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/* --- mappingproxy: read-only proxy for mappings --- */
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/* This has no reason to be in this file except that adding new files is a
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bit of a pain */
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typedef struct {
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PyObject_HEAD
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PyObject *dict;
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} proxyobject;
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PyObject *mapping;
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} mappingproxyobject;
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static Py_ssize_t
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proxy_len(proxyobject *pp)
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mappingproxy_len(mappingproxyobject *pp)
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{
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return PyObject_Size(pp->dict);
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return PyObject_Size(pp->mapping);
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}
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static PyObject *
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proxy_getitem(proxyobject *pp, PyObject *key)
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mappingproxy_getitem(mappingproxyobject *pp, PyObject *key)
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{
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return PyObject_GetItem(pp->dict, key);
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return PyObject_GetItem(pp->mapping, key);
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}
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static PyMappingMethods proxy_as_mapping = {
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(lenfunc)proxy_len, /* mp_length */
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(binaryfunc)proxy_getitem, /* mp_subscript */
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static PyMappingMethods mappingproxy_as_mapping = {
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(lenfunc)mappingproxy_len, /* mp_length */
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(binaryfunc)mappingproxy_getitem, /* mp_subscript */
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0, /* mp_ass_subscript */
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};
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static int
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proxy_contains(proxyobject *pp, PyObject *key)
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mappingproxy_contains(mappingproxyobject *pp, PyObject *key)
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{
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return PyDict_Contains(pp->dict, key);
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if (PyDict_CheckExact(pp->mapping))
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return PyDict_Contains(pp->mapping, key);
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else
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return PySequence_Contains(pp->mapping, key);
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}
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static PySequenceMethods proxy_as_sequence = {
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static PySequenceMethods mappingproxy_as_sequence = {
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0, /* sq_length */
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0, /* sq_concat */
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0, /* sq_repeat */
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@ -740,152 +743,199 @@ static PySequenceMethods proxy_as_sequence = {
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0, /* sq_slice */
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0, /* sq_ass_item */
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0, /* sq_ass_slice */
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(objobjproc)proxy_contains, /* sq_contains */
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(objobjproc)mappingproxy_contains, /* sq_contains */
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0, /* sq_inplace_concat */
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0, /* sq_inplace_repeat */
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};
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static PyObject *
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proxy_get(proxyobject *pp, PyObject *args)
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mappingproxy_get(mappingproxyobject *pp, PyObject *args)
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{
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PyObject *key, *def = Py_None;
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_Py_IDENTIFIER(get);
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if (!PyArg_UnpackTuple(args, "get", 1, 2, &key, &def))
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return NULL;
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return _PyObject_CallMethodId(pp->dict, &PyId_get, "(OO)", key, def);
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return _PyObject_CallMethodId(pp->mapping, &PyId_get, "(OO)", key, def);
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}
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static PyObject *
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proxy_keys(proxyobject *pp)
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mappingproxy_keys(mappingproxyobject *pp)
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{
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_Py_IDENTIFIER(keys);
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return _PyObject_CallMethodId(pp->dict, &PyId_keys, NULL);
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return _PyObject_CallMethodId(pp->mapping, &PyId_keys, NULL);
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}
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static PyObject *
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proxy_values(proxyobject *pp)
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mappingproxy_values(mappingproxyobject *pp)
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{
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_Py_IDENTIFIER(values);
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return _PyObject_CallMethodId(pp->dict, &PyId_values, NULL);
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return _PyObject_CallMethodId(pp->mapping, &PyId_values, NULL);
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}
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static PyObject *
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proxy_items(proxyobject *pp)
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mappingproxy_items(mappingproxyobject *pp)
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{
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_Py_IDENTIFIER(items);
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return _PyObject_CallMethodId(pp->dict, &PyId_items, NULL);
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return _PyObject_CallMethodId(pp->mapping, &PyId_items, NULL);
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}
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static PyObject *
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proxy_copy(proxyobject *pp)
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mappingproxy_copy(mappingproxyobject *pp)
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{
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_Py_IDENTIFIER(copy);
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return _PyObject_CallMethodId(pp->dict, &PyId_copy, NULL);
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return _PyObject_CallMethodId(pp->mapping, &PyId_copy, NULL);
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}
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static PyMethodDef proxy_methods[] = {
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{"get", (PyCFunction)proxy_get, METH_VARARGS,
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/* WARNING: mappingproxy methods must not give access
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to the underlying mapping */
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static PyMethodDef mappingproxy_methods[] = {
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{"get", (PyCFunction)mappingproxy_get, METH_VARARGS,
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PyDoc_STR("D.get(k[,d]) -> D[k] if k in D, else d."
|
||||
" d defaults to None.")},
|
||||
{"keys", (PyCFunction)proxy_keys, METH_NOARGS,
|
||||
" d defaults to None.")},
|
||||
{"keys", (PyCFunction)mappingproxy_keys, METH_NOARGS,
|
||||
PyDoc_STR("D.keys() -> list of D's keys")},
|
||||
{"values", (PyCFunction)proxy_values, METH_NOARGS,
|
||||
{"values", (PyCFunction)mappingproxy_values, METH_NOARGS,
|
||||
PyDoc_STR("D.values() -> list of D's values")},
|
||||
{"items", (PyCFunction)proxy_items, METH_NOARGS,
|
||||
{"items", (PyCFunction)mappingproxy_items, METH_NOARGS,
|
||||
PyDoc_STR("D.items() -> list of D's (key, value) pairs, as 2-tuples")},
|
||||
{"copy", (PyCFunction)proxy_copy, METH_NOARGS,
|
||||
{"copy", (PyCFunction)mappingproxy_copy, METH_NOARGS,
|
||||
PyDoc_STR("D.copy() -> a shallow copy of D")},
|
||||
{0}
|
||||
};
|
||||
|
||||
static void
|
||||
proxy_dealloc(proxyobject *pp)
|
||||
mappingproxy_dealloc(mappingproxyobject *pp)
|
||||
{
|
||||
_PyObject_GC_UNTRACK(pp);
|
||||
Py_DECREF(pp->dict);
|
||||
Py_DECREF(pp->mapping);
|
||||
PyObject_GC_Del(pp);
|
||||
}
|
||||
|
||||
static PyObject *
|
||||
proxy_getiter(proxyobject *pp)
|
||||
mappingproxy_getiter(mappingproxyobject *pp)
|
||||
{
|
||||
return PyObject_GetIter(pp->dict);
|
||||
return PyObject_GetIter(pp->mapping);
|
||||
}
|
||||
|
||||
static PyObject *
|
||||
proxy_str(proxyobject *pp)
|
||||
mappingproxy_str(mappingproxyobject *pp)
|
||||
{
|
||||
return PyObject_Str(pp->dict);
|
||||
return PyObject_Str(pp->mapping);
|
||||
}
|
||||
|
||||
static PyObject *
|
||||
proxy_repr(proxyobject *pp)
|
||||
mappingproxy_repr(mappingproxyobject *pp)
|
||||
{
|
||||
return PyUnicode_FromFormat("dict_proxy(%R)", pp->dict);
|
||||
return PyUnicode_FromFormat("mappingproxy(%R)", pp->mapping);
|
||||
}
|
||||
|
||||
static int
|
||||
proxy_traverse(PyObject *self, visitproc visit, void *arg)
|
||||
mappingproxy_traverse(PyObject *self, visitproc visit, void *arg)
|
||||
{
|
||||
proxyobject *pp = (proxyobject *)self;
|
||||
Py_VISIT(pp->dict);
|
||||
mappingproxyobject *pp = (mappingproxyobject *)self;
|
||||
Py_VISIT(pp->mapping);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static PyObject *
|
||||
proxy_richcompare(proxyobject *v, PyObject *w, int op)
|
||||
mappingproxy_richcompare(mappingproxyobject *v, PyObject *w, int op)
|
||||
{
|
||||
return PyObject_RichCompare(v->dict, w, op);
|
||||
return PyObject_RichCompare(v->mapping, w, op);
|
||||
}
|
||||
|
||||
static int
|
||||
mappingproxy_check_mapping(PyObject *mapping)
|
||||
{
|
||||
if (!PyMapping_Check(mapping)
|
||||
|| PyList_Check(mapping)
|
||||
|| PyTuple_Check(mapping)) {
|
||||
PyErr_Format(PyExc_TypeError,
|
||||
"mappingproxy() argument must be a mapping, not %s",
|
||||
Py_TYPE(mapping)->tp_name);
|
||||
return -1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static PyObject*
|
||||
mappingproxy_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
|
||||
{
|
||||
static char *kwlist[] = {"mapping", NULL};
|
||||
PyObject *mapping;
|
||||
mappingproxyobject *mappingproxy;
|
||||
|
||||
if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:mappingproxy",
|
||||
kwlist, &mapping))
|
||||
return NULL;
|
||||
|
||||
if (mappingproxy_check_mapping(mapping) == -1)
|
||||
return NULL;
|
||||
|
||||
mappingproxy = PyObject_GC_New(mappingproxyobject, &PyDictProxy_Type);
|
||||
if (mappingproxy == NULL)
|
||||
return NULL;
|
||||
Py_INCREF(mapping);
|
||||
mappingproxy->mapping = mapping;
|
||||
_PyObject_GC_TRACK(mappingproxy);
|
||||
return (PyObject *)mappingproxy;
|
||||
}
|
||||
|
||||
PyTypeObject PyDictProxy_Type = {
|
||||
PyVarObject_HEAD_INIT(&PyType_Type, 0)
|
||||
"dict_proxy", /* tp_name */
|
||||
sizeof(proxyobject), /* tp_basicsize */
|
||||
"mappingproxy", /* tp_name */
|
||||
sizeof(mappingproxyobject), /* tp_basicsize */
|
||||
0, /* tp_itemsize */
|
||||
/* methods */
|
||||
(destructor)proxy_dealloc, /* tp_dealloc */
|
||||
(destructor)mappingproxy_dealloc, /* tp_dealloc */
|
||||
0, /* tp_print */
|
||||
0, /* tp_getattr */
|
||||
0, /* tp_setattr */
|
||||
0, /* tp_reserved */
|
||||
(reprfunc)proxy_repr, /* tp_repr */
|
||||
(reprfunc)mappingproxy_repr, /* tp_repr */
|
||||
0, /* tp_as_number */
|
||||
&proxy_as_sequence, /* tp_as_sequence */
|
||||
&proxy_as_mapping, /* tp_as_mapping */
|
||||
&mappingproxy_as_sequence, /* tp_as_sequence */
|
||||
&mappingproxy_as_mapping, /* tp_as_mapping */
|
||||
0, /* tp_hash */
|
||||
0, /* tp_call */
|
||||
(reprfunc)proxy_str, /* tp_str */
|
||||
(reprfunc)mappingproxy_str, /* tp_str */
|
||||
PyObject_GenericGetAttr, /* tp_getattro */
|
||||
0, /* tp_setattro */
|
||||
0, /* tp_as_buffer */
|
||||
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
|
||||
0, /* tp_doc */
|
||||
proxy_traverse, /* tp_traverse */
|
||||
mappingproxy_traverse, /* tp_traverse */
|
||||
0, /* tp_clear */
|
||||
(richcmpfunc)proxy_richcompare, /* tp_richcompare */
|
||||
(richcmpfunc)mappingproxy_richcompare, /* tp_richcompare */
|
||||
0, /* tp_weaklistoffset */
|
||||
(getiterfunc)proxy_getiter, /* tp_iter */
|
||||
(getiterfunc)mappingproxy_getiter, /* tp_iter */
|
||||
0, /* tp_iternext */
|
||||
proxy_methods, /* tp_methods */
|
||||
mappingproxy_methods, /* tp_methods */
|
||||
0, /* tp_members */
|
||||
0, /* tp_getset */
|
||||
0, /* tp_base */
|
||||
0, /* tp_dict */
|
||||
0, /* tp_descr_get */
|
||||
0, /* tp_descr_set */
|
||||
0, /* tp_dictoffset */
|
||||
0, /* tp_init */
|
||||
0, /* tp_alloc */
|
||||
mappingproxy_new, /* tp_new */
|
||||
};
|
||||
|
||||
PyObject *
|
||||
PyDictProxy_New(PyObject *dict)
|
||||
PyDictProxy_New(PyObject *mapping)
|
||||
{
|
||||
proxyobject *pp;
|
||||
mappingproxyobject *pp;
|
||||
|
||||
pp = PyObject_GC_New(proxyobject, &PyDictProxy_Type);
|
||||
if (mappingproxy_check_mapping(mapping) == -1)
|
||||
return NULL;
|
||||
|
||||
pp = PyObject_GC_New(mappingproxyobject, &PyDictProxy_Type);
|
||||
if (pp != NULL) {
|
||||
Py_INCREF(dict);
|
||||
pp->dict = dict;
|
||||
Py_INCREF(mapping);
|
||||
pp->mapping = mapping;
|
||||
_PyObject_GC_TRACK(pp);
|
||||
}
|
||||
return (PyObject *)pp;
|
||||
|
|
|
|||
Loading…
Reference in New Issue