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+---
+Title: 'UserDict'
+Description: 'A wrapper class from collections that allows creating customized dictionary-like objects by subclassing it instead of dict.'
+Subjects:
+  - 'Computer Science'
+  - 'Data Science'
+Tags:
+  - 'Classes'
+  - 'Dictionary'
+  - 'Python'
+CatalogContent:
+  - 'learn-python-3'
+  - 'paths/computer-science'
+---
+
+In Python, **`UserDict`** is a class in the `collections` module that provides a wrapper around [dictionary](https://www.codecademy.com/resources/docs/python/dictionaries) objects. It allows creating custom dictionary-like classes by extending `UserDict` and overriding its methods, making it useful for building specialized dictionaries with additional functionality or behavior.
+
+## Syntax
+
+```pseudo
+collections.UserDict([initialdata])
+```
+
+**Parameters:**
+
+- `initialdata`: The `UserDict` constructor can take an optional dictionary or mapping object to initialize the data.
+
+**Return value:**
+
+Returns a dictionary-like object that can be subclassed to customize behavior.
+
+## Example 1: Subclassing `UserDict`
+
+In this example, a custom class is created by subclassing `UserDict` and overriding common dictionary methods. This shows how to extend and customize dictionary behavior:
+
+```py
+from collections import UserDict
+
+class MyUserDict(UserDict):
+  def __setitem__(self, key, value):
+    print(f"Setting {key} = {value}")
+    super().__setitem__(key, value)
+
+  def __getitem__(self, key):
+    print(f"Getting {key}")
+    return super().__getitem__(key)
+
+d = MyUserDict()
+d["x"] = 42
+print(d["x"])
+```
+
+The output is:
+
+```shell
+Setting x = 42
+Getting x
+42
+```
+
+## Example 2: Basic Wrapper Usage
+
+In this example, `UserDict` is used directly to wrap a dictionary. The `.data` attribute exposes the underlying dictionary object:
+
+```py
+from collections import UserDict
+
+d = UserDict({"a": 1})
+d["b"] = 2
+print(d)
+print(d.data)
+```
+
+The output is:
+
+```shell
+UserDict({'a': 1, 'b': 2})
+{'a': 1, 'b': 2}
+```
+
+## Example 3: Logging on Set/Delete
+
+In this example, dictionary modifications are logged by overriding `__setitem__` and `__delitem__`:
+
+```py
+from collections import UserDict
+
+class LoggingDict(UserDict):
+  def __setitem__(self, key, value):
+    print(f"SET {key!r} = {value!r}")
+    super().__setitem__(key, value)
+
+  def __delitem__(self, key):
+    print(f"DEL {key!r}")
+    super().__delitem__(key)
+
+d = LoggingDict()
+d["name"] = "Aris"
+del d["name"]
+```
+
+The output is:
+
+```shell
+SET 'name' = 'Aris'
+DEL 'name'
+```
+
+## Example 4: Case-Insensitive Keys
+
+In this example, keys are treated case-insensitively by normalizing them to lowercase before storing or retrieving:
+
+```py
+from collections import UserDict
+
+class CaseInsensitiveDict(UserDict):
+  def _key(self, key):
+    return key.lower() if isinstance(key, str) else key
+
+  def __setitem__(self, key, value):
+    super().__setitem__(self._key(key), value)
+
+  def __getitem__(self, key):
+    return super().__getitem__(self._key(key))
+
+d = CaseInsensitiveDict()
+d["Name"] = "Mamta"
+print(d["name"])
+print(d["NAME"])
+```
+
+The output is:
+
+```shell
+Mamta
+Mamta
+```
+
+## Codebyte Example: Default-Like Behavior
+
+In this example, a default factory is added, similar to `collections.defaultdict`, so missing keys automatically get initialized:
+
+```py
+from collections import UserDict
+
+class DefaultUserDict(UserDict):
+  def __init__(self, default_factory=None, *args, **kwargs):
+    super().__init__(*args, **kwargs)
+    self.default_factory = default_factory
+
+  def __missing__(self, key):
+    if self.default_factory is None:
+      raise KeyError(key)
+    self[key] = self.default_factory()
+    return self[key]
+
+d = DefaultUserDict(list)
+d["a"].append(10)
+print(d)
+```