可以在 Python 中使用點表示法存取字典成員嗎？

Dot Notation for Dictionary Access: Extending Python's Dictionary Class

In Python, accessing dictionary members typically requires the bracket notation, such as mydict['key']. However, it is possible to use dot notation for the same purpose, making it more convenient and readable. This can be particularly useful for accessing nested dictionaries.

One way to achieve this is by implementing a custom class that extends the built-in dict class. The dotdict class presented here:

• Redefines the getattr method to allow accessing dictionary keys using dot notation.
• Overrides the setattr and delattr methods to make dot notation work for setting and deleting attributes.

class dotdict(dict):
    """dot.notation access to dictionary attributes"""
    __getattr__ = dict.get
    __setattr__ = dict.__setitem__
    __delattr__ = dict.__delitem__

To use the dotdict class:

mydict = {'val': 'it works'}
nested_dict = {'val': 'nested works too'}
mydict = dotdict(mydict)

Now, you can access dictionary members using dot notation:

mydict.val  # 'it works'

You can even access nested dictionaries in the same way:

mydict.nested = dotdict(nested_dict)
mydict.nested.val  # 'nested works too'

This method provides a convenient and intuitive way to interact with dictionaries, especially when dealing with deeply nested structures.

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