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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 in a more concise way.

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

Click to Enlarge

Posted By -	Karan Gupta

Posted On -	Friday, October 15, 2021

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