Suppose , we have to add additional information about user. So,how can we add a additional information when we need? With help of optional argument which has default value string. We will return a dictionary which come additional information about a user.

 # creating a function
def build_person(fname,lname,    
                               age=” ):
         
           “”” Return a information

about a person “””

# storing dictionary in a variable

person     ={                            

                     “first “:fname,    

 
                     “last”:lname ,     

                       }  
 
# using if condition

# if this condition is true then

# age key add to dictionary.
         if age:
             person[“age”] = age
         return person

>>>musicians = build_person(“vipul”,”kunwar”,19)
>>>print(musicians)

Output:{“first”:”vipul “,”last “:“kunwar “,age:19}

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