我们从Python开源项目中，提取了以下5个代码示例，用于说明如何使用types.DictProxyType()。
def __dir__(self): def get_attrs(obj): import types if not hasattr(obj, '__dict__'): return [] # slots only if not isinstance(obj.__dict__, (dict, types.DictProxyType)): raise TypeError("%s.__dict__ is not a dictionary" "" % obj.__name__) return obj.__dict__.keys() def dir2(obj): attrs = set() if not hasattr(obj, '__bases__'): # obj is an instance if not hasattr(obj, '__class__'): # slots return sorted(get_attrs(obj)) klass = obj.__class__ attrs.update(get_attrs(klass)) else: # obj is a class klass = obj for cls in klass.__bases__: attrs.update(get_attrs(cls)) attrs.update(dir2(cls)) attrs.update(get_attrs(obj)) return list(attrs) return dir2(self)
def __dir__(self): def get_attrs(obj): import types if not hasattr(obj, '__dict__'): return [] if not isinstance(obj.__dict__, (dict, types.DictProxyType)): raise TypeError( '{0}.__dict__ is not a dictionary'.format(obj.__name__)) return obj.__dict__.keys() def dir2(obj): attrs = set() if not hasattr(obj, '__bases__'): # obj is an instance if not hasattr(obj, '__class__'): # slots return sorted(get_attrs(obj)) klass = obj.__class__ attrs.update(get_attrs(klass)) else: # obj is a class klass = obj for cls in klass.__bases__: attrs.update(get_attrs(cls)) attrs.update(dir2(cls)) attrs.update(get_attrs(obj)) return list(attrs) return dir2(self) + self.keys() # TODO: Ditch this behavior. (Backwards incompatible change!) # It's probably that at some point a user is going create a method named # the same as a key fetched from PIX.
def _get_attrs(obj): from types import DictProxyType if not hasattr(obj, '__dict__'): # pragma: no cover return [] # slots only if not isinstance(obj.__dict__, (dict, DictProxyType)): # pragma: no cover raise TypeError("{}.__dict__ is not a dictionary".format( obj.__name__)) return obj.__dict__.keys() # https://stackoverflow.com/questions/ # 15507848/the-correct-way-to-override-the-dir-method-in-python
def test_dictproxy(): # This is the dictproxy constructor itself from the Python API, DP = ctypes.pythonapi.PyDictProxy_New DP.argtypes, DP.restype = (ctypes.py_object,), ctypes.py_object underlying_dict = {} mp_recursive = DP(underlying_dict) underlying_dict[0] = mp_recursive underlying_dict[-3] = underlying_dict cases = [ (DP({}), "dict_proxy({})"), (DP({None: DP({})}), "dict_proxy({None: dict_proxy({})})"), (DP({k: k.lower() for k in string.ascii_uppercase}), "dict_proxy({'A': 'a',\n" " 'B': 'b',\n" " 'C': 'c',\n" " 'D': 'd',\n" " 'E': 'e',\n" " 'F': 'f',\n" " 'G': 'g',\n" " 'H': 'h',\n" " 'I': 'i',\n" " 'J': 'j',\n" " 'K': 'k',\n" " 'L': 'l',\n" " 'M': 'm',\n" " 'N': 'n',\n" " 'O': 'o',\n" " 'P': 'p',\n" " 'Q': 'q',\n" " 'R': 'r',\n" " 'S': 's',\n" " 'T': 't',\n" " 'U': 'u',\n" " 'V': 'v',\n" " 'W': 'w',\n" " 'X': 'x',\n" " 'Y': 'y',\n" " 'Z': 'z'})"), (mp_recursive, "dict_proxy({-3: {-3: {...}, 0: {...}}, 0: {...}})"), ] for obj, expected in cases: nt.assert_is_instance(obj, types.DictProxyType) # Meta-test nt.assert_equal(pretty.pretty(obj), expected) nt.assert_equal(pretty.pretty(underlying_dict), "{-3: {...}, 0: dict_proxy({-3: {...}, 0: {...}})}")
