python dict setdefault
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The setdefault() method in Python is a convenient way to insert a key-value pair into a dictionary if the key does not already exist, and retrieve the value associated with the key if it does. This method is particularly useful when you want to ensure that a specific key is present in the dictionary, and if it's not, you can set a default value for that key.
Let's walk through a series of examples to illustrate the use of setdefault().
In this example, the key 'd' doesn't exist in the dictionary, so setdefault() adds it with the default value 4.
In this case, since the key 'b' already exists, setdefault() does not modify the dictionary.
Here, if the key 'd' doesn't exist, it will be added with an empty list as the default value. Then, the value (4) is appended to the list.
In this example, if the key 'c' doesn't exist within the nested dictionary under 'a', both 'a' and 'c' will be added.
The setdefault() method is a powerful tool for managing dictionaries in Python, especially when you want to ensure the presence of specific keys and provide default values when necessary.
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