How to use __missing__ method in autotest

Best Python code snippet using autotest_python

test_userdict.py

Source:test_userdict.py Github

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...120 # (E) subclass defines __missing__ method raising RuntimeError121 # (F) subclass sets __missing__ instance variable (no effect)122 # (G) subclass doesn't define __missing__ at a all123 class D(collections.UserDict):124 def __missing__(self, key):125 return 42126 d = D({1: 2, 3: 4})127 self.assertEqual(d[1], 2)128 self.assertEqual(d[3], 4)129 self.assertNotIn(2, d)130 self.assertNotIn(2, d.keys())131 self.assertEqual(d[2], 42)132 class E(collections.UserDict):133 def __missing__(self, key):134 raise RuntimeError(key)135 e = E()136 try:137 e[42]138 except RuntimeError as err:139 self.assertEqual(err.args, (42,))140 else:141 self.fail("e[42] didn't raise RuntimeError")142 class F(collections.UserDict):143 def __init__(self):144 # An instance variable __missing__ should have no effect145 self.__missing__ = lambda key: None146 collections.UserDict.__init__(self)147 f = F()...

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demo_3_7.py

Source:demo_3_7.py Github

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...15因为那也会导致 __contains__ 被递归调用。16为了避免这一情况，这里采取了更显式的方法，直接在这个 self.keys() 里查询17'''18class StrKeyDict0(dict):19 def __missing__(self, key):20 # 如果找不到的键本身就是字符串，那就抛出 KeyError 异常21 if isinstance(key, str):22 raise KeyError(key)23 # 如果找不到的键不是字符串，那么把它转换成字符串再进行查找24 return self[str(key)]25 def get(self, key, default=None):26 try:27 # get 方法把查找工作用 self[key] 的形式委托给 __getitem__， 28 # 这样在宣布查找失败之前，还能通过 __missing__ 再给某个键一个机会29 return self[key]30 except KeyError:31 # 如果抛出 KeyError，那么说明 __missing__ 也失败了，于是返回 default32 return default33 ...

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3_4_2.py

Source:3_4_2.py Github

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...8 提供 __missing__ 方法对 get 或者 __contains__(in 运算符会用到这个方法)这9 些方法的使用没有影响。10'''11class StrKeyDict0(dict):12 def __missing__(self, key):13 '''14 如果找不到的键不是字符串，则转换成他的字符串形式再查找，15 如果是字符串则抛出KeyError.16 为什么要判断key是不是字符串：17 如果没有这个测试,只要 str(k) 返回的是一个存在的键,那么 __missing__ 方法是没18 问题的,不管是字符串键还是非字符串键,它都能正常运行。但是如果 str(k) 不是一个19 存在的键,代码就会陷入无限递归。这是因为 __missing__ 的最后一行中的20 self[str(key)] 会调用 __getitem__,而这个 str(key) 又不存在,于是21 __missing__ 又会被调用。22 '''23 if isinstance(key,str):24 raise KeyError(key)25 return self[str(key)]26 def get(self,key,default=None):...

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