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Python types of parameters: Here, we are going to learn about the types of the parameters python.
Submitted by Pankaj Singh, on October 11, 2018

There are following types of parameters in python:

1. Required parameters
2. Default parameters
3. Keyword/named parameters
4. Variable length parameters

1) Required parameters

If we define a function in python with parameters, so while calling that function – it is must send those parameters because they are Required parameters.

# Required parameter
def show(id,name):
    print("Your id is :",id,"and your name is :",name)

show(12,"deepak")
# show() #error
# show(12) #error

Output

Your id is : 12 and your name is : deepak

2) Default parameters

If we define the parameters as default parameters, there will not any error occurred even you do not pass the parameter or pass the less parameters.

# Default parameters
def show(id="<no id>",name="<no name>"):
    print("Your id is :",id,"and your name is :",name)

show(12,"deepak")
show()
show(12)

Output

Your id is : 12 and your name is : deepak
Your id is : <no id> and your name is : <no name>
Your id is : 12 and your name is : <no name>

3) Keyword/named parameters

Python has dynamic types – so if we send parameters in the wrong sequence, it will accept the values due to dynamic typing. But, this data is not correct so to prevent this, we use keyword/named parameter.

# keyword/named parameters
def show(id="<no id>",name="<no name>"):
    print("Your id is :",id,"and your name is :",name)

# defualt/correct sequance 	
show(12,"deepak")
# sequence with the keywords
# there is no need to rememeber the parameters sequences
# provide the value with the name/argument name
show(name="priya",id=34)

Output

Your id is : 12 and your name is : deepak
Your id is : 34 and your name is : priya

4) Variable length parameters

By using *args, we can pass any number of arguments to the function in python.

# Variable length parameters 
def sum(*data):
    s=0
    for item in data:
       s+=item
    print("Sum :",s)

sum()
sum(12)
sum(12,4)
sum(12,4,6)
sum(1,2,3,4,5,6,7,8)
sum(12,45,67,78,90,56)

Output

Sum : 0
Sum : 12
Sum : 16
Sum : 22
Sum : 36
Sum : 348

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