update 03-notes

linearalgebrayhz · linearalgebrayhz · commit 66b9a66b87f6 · 2024-07-14T02:03:15.000+08:00
diff --git a/03-dict-set/03-notes.ipynb b/03-dict-set/03-notes.ipynb
@@ -0,0 +1,93 @@
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+    "# Ch3 字典和集合\n",
+    "本质是散列表\n",
+    "\n",
+    "## 3.1 泛映射类型\n",
+    "\n",
+    "> collections.abc 模块中有Mapping 和 MutableMapping 这两个抽象基类，它们的作用是为字典和集合dict和其他类似的类型定义形式接口\n",
+    "\n",
+    "继承树：\n",
+    "\n",
+    "`Container` class\n",
+    "- `__contains__`\n",
+    "  \n",
+    "`Iterable` class\n",
+    "- `__iter__`\n",
+    "\n",
+    "`Sized` class\n",
+    "- `__len__`\n",
+    "\n",
+    "`Mapping` class extends `Container`, `Iterable`, `Sized`\n",
+    "- `__getitem__`\n",
+    "- `___contains__`\n",
+    "- `__eq__`\n",
+    "- `__ne__`\n",
+    "- `get`\n",
+    "- `keys`\n",
+    "- `items`\n",
+    "- `values`\n",
+    "\n",
+    "`MutableMapping` class extends `Mapping`\n",
+    "- `__setitem__`\n",
+    "- `__delitem__`\n",
+    "- `pop`\n",
+    "- `popitem`\n",
+    "- `clear`\n",
+    "- `update`\n",
+    "- `setdefault`\n",
+    "\n",
+    "> 然而，非抽象映射类型一般不会直接继承这些抽象基类，它们会直接对`dict`或是`collections.User.Dict`进行扩展。这些抽象基类的主要作用是作为形式化的文档，它们定义了构建一个映射类型所需要的最基本的接口。\n"
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+   ],
+   "source": [
+    "import collections.abc as abc\n",
+    "\n",
+    "my_dict = {}\n",
+    "isinstance(my_dict, abc.Mapping)\n",
+    "#这里用isinstance而不是type来检查某个参数是否为dict类型，因为这个参数有可能不是dict，而是一个比较另类的映射类型。"
+   ]
+  }
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