Function Arguments

In this part, we are going to deep dive about different types of arguments in functions

Below are the types of arguments

• Default Arguments
• positional Arguments
• Keyword Arguments
• Arbitrary Positional Arguments
• Arbitrary keyword arguments

Default Arguments

Function Definition with default value for num2 and non-default value for num1

Default argument should be declare after the Non-default arguments

#Default Arguments
#num2 is default argument here
def add(num1, num2=100):
    value1 = num1
    value2 = num2
    sum = value1 + value2
    return sum

#Function Calling 
result = add(10, 20)
print(result)

#Default argument is optional
result = add(50)
print(result)

Output

30
150

Positional Arguments

When we are calling the function, the order of passing arguments should be matched with the order of parameters in function definition

#positional Arguments
def add(num1, num2:
    value1 = num1
    value2 = num2
    sum = value1 + value2
    return sum

#Function Calling 
#Automatically 10 is assigns with num1 and 20 is assigns with num2
result = add(10, 20)
print(result)

Output

30
150

Keyword Arguments

In keyword arguments, we can change the order of the arguments by explicitly mentioned the function parameter name

#Keyword Arguments
def add(num1, num2):
    value1 = num1
    value2 = num2
    print("The value of num1 is : {}".format(num1))
    print("The value of num2 is : {}".format(num2))
    sum = value1 + value2
    return sum

#Function Calling with keyword arguments
result = add(num2=10, num1=20)
print(result)

Output

The value of num1 is : 20
The value of num2 is : 10
30

Arbitrary Positional Arguments

When we are unsure on the number of parameters should be declare during function definition, asterisk (*) can place to get the dynamic positional arguments

#Arbitrary Positional Arguments
def add(*args):
    sum=0
    for each in args:
        sum = sum + each
    return sum

#Function Calling with Arbitrary Positional Arguments
result = add(10, 20, 30)
print(result)

Output

60

Arbitrary Keyword Arguments

Double asterisk (**) can place to get the dynamic keyword arguments

#Arbitrary Keyword Arguments
def add(**args):
    sum=0
    for key, value in args.items():
        print(key, value)
        sum = sum + value
    return sum

#Function Calling with Arbitrary Keyword Arguments
result = add(num1=10, num2=20, num3=30)
print(result)

Output

num1 10
num2 20
num3 30
60