setdefault( ) FUNCTION

The setdefault( ) Function sets a default value for an Entry(i.e. A Key Value pair) in the 'Dictionary'.

Example :

x = {
    5 : "Is a Number", 
    "John": "Is a Name", 
    "Python": "Is a Language"
}
x.setdefault("Rose", "Is a Flower")
print(x)

Output :

{5: 'Is a Number', 'John': 'Is a Name', 'Python': 'Is a Language', 'Rose': 'Is a Flower'}

So, in the above code we have created a 'Dictionary' using braces '{ }' and 'Key' and 'Value' pairs.

x = {
    5 : "Is a Number", 
    "John": "Is a Name", 
    "Python": "Is a Language"
}

And initialised to the variable 'x'.

Then we have used the 'setdefault( )' Function to set a default value for the 'Key', 'Rose'.

x.setdefault("Rose", "Is a Flower")

And, since the Key, 'Rose' is not present in the Dictionary. The Key, 'Rose' is added with the default value 'Is a Flower'.

And if you see the Output, 'x' contains all the four entries.

Output :

{5: 'Is a Number', 'John': 'Is a Name', 'Python': 'Is a Language', 'Rose': 'is a Flower'}

And if the entry with the 'Key' "Rose" is already present. No change is made to it.

Example :

x = {
    5 : "Is a Number", 
    "John": "Is a Name", 
    "Python": "Is a Language"
    "Rose": "Is a red Flower"
}
x.setdefault("Rose", "is a Flower")
print(x)

Output :

{5: 'Is a Number', 'John': 'Is a Name', 'Python': 'Is a Language', 'Rose': 'Is a red Flower'}

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