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Setdefault Method Of Dictionary In Python

In this article, we will discuss the "setdefault" method of the dictionary object in Python.

Scenario

Consider the following dictionary: -

car = {  
  "model": "Breeza",
  "year": 2016
}

Our requirement is: -

If the key "brand" does not exist in the dictionary then add the key
Returns the value of the key "brand"

So, the above requirement could be achieved using the following code: -

car = {  
  "model": "Breeza",
  "year": 2016
}

if any("brand" in d for d in car)== False:
    car["brand"] = "Maruti"
    print(car["brand"])

There is no issue with the above code. But the above logic could be written more concisely. We can use the "setdefault" method of the dictionary object.

Setdefault Method In Action

You can achieve the above requirement using the setdefault method.

car = {  
  "model": "Breeza",
  "year": 2016
}

car.setdefault("Brand", "Maruti")


print(car["Brand"])
print(car)

Output

Posted By -	Karan Gupta

Posted On -	Friday, October 15, 2021

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