python3 understand usage of setdefault dictionary method

Certainly! The setdefault() method in Python dictionaries is a convenient way to set a key to a default value if the key is not already in the dictionary. It helps avoid unnecessary code for checking whether a key exists or not. If the key is present, it returns the value associated with the key. If the key is not present, it sets the key with the specified default value and returns that value.
Here is an informative tutorial on the setdefault() method in Python dictionaries with code examples to demonstrate its usage:
Let's start with a simple example to understand how setdefault() works:
In the first setdefault() call, 'grapes' is not present in the dictionary, so it is added with a default value of 0. In the second call, 'oranges' is already present, so the existing value (3) is returned.
The setdefault() method can be particularly useful for nested dictionaries:
Here, setdefault() is used to add a new subject with a default value for a student if that subject is not already present in their record.
The setdefault() method is a handy tool for working with dictionaries, especially when you want to set default values for keys that might not exist. It streamlines code by avoiding explicit conditional checks for the existence of keys in dictionaries.
Remember, setdefault() is an effective method to use when you need to set a default value for a key in a dictionary only if that key is not already present.
Feel free to experiment and integrate this method into your Python code to make your dictionary handling more efficient and concise!
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