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Default Function Arguments In Python

In this article, we will discuss default function arguments in Python.

Scenario

Consider the following function definition: -

def PersonInformation(name, address):
    print ('person name is:', name)
    print ('person address is:', address)
    return

When we are calling this function, we pass 2 parameters like: -

PersonInformation("gyan","India")

If we pass only 1 parameter (or no parameter).

PersonInformation(address="india")

The above code will give an error: -

TypeError: PersonInformation() missing 1 required positional argument: ‘name’

Default Function Argument

There is a feature in Python called default function argument where we can pass a predefined argument value (called default value) inside the function definition. So, the function definition would be: -

def PersonInformation(name='gyan', address=''):
    print ('person name is:', name)
    print ('person address is:', address)
    return

Now if we call the above method.

PersonInformation(address="india")

Output

Using Default Function Arguments When The Number Of Parameters Is Not Known

Consider an example where we do not know the number of parameters is not known at the time of call. Consider the following code: -

def HelloWorld2(*allPeople):
    for x in allPeople:
        print ('Hello', x)

You can call the function and pass as many parameters as you require.

HelloWorld2("amit","sumit","Kiran")

Output

Posted By -	Karan Gupta

Posted On -	Thursday, April 18, 2019

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