Discover More about Function calls in Python on Day 18

Introduction :

Welcome back to my Python journey! Yesterday, I laid the foundation with control structures in python.

Today, I dove into Function calling, Let's explore what I learned!

Function

• python does not support call by value mechanism

• python only works according to call by reference mechanism.

• in python call by ref mechanism can behave in two different ways,

• call by reference as call by reference

• by modifying an object if the location / id / address / reference is same.

• list object as parameter ,set object ,dictionary object

• call by reference as call by value

• by modifying an object if the location / id / address / ref is different

• int object as parameter ,float object ,complex object ,str object ,tuple object

int object as parameter

def bbsr ( fp ) :
        print ( 'info of formal param before modification : ', fp , id ( fp ))
        # modify fp 
        fp = fp + 10
        print ( 'info of formal param after  modification : ', fp , id ( fp ))
        return fp

def main () :
        ap = 10
        print ( 'info of actual param : ' , ap , id ( ap ) )
        ap = bbsr ( ap )
        print ( 'info of actual param : ' , ap , id ( ap ) )

main ()

list object as parameter

def bbsr ( fp ) :
        print ( 'info of formal param before modification : ', fp , id ( fp ))
        fp . append ( 40 )
        fp . append ( 50 )
        print ( 'info of formal param aftre  modification : ', fp , id ( fp ))

def main () :
        ap = [ 10, 20, 30 ]
        print ( 'info of actual param : ' , ap , id ( ap ) )
        bbsr ( ap )
        print ( 'info of actual param : ' , ap , id ( ap ) )


main ()

string object as parameter

def bbsr ( fp ) :
        print ( 'info of formal param : ', fp , id ( fp ) )
        fp = fp . upper ()
        print ( 'fp : ' , fp )
        return fp

def main () :
        ap = "india"
        print ( 'info of actual param : ' , ap , id ( ap ) )
        ap = bbsr ( ap )
        print ( 'ap : ', ap )

main ()

return statement

• . to affect the actual param through formal param in call by value return statement will be applicable.

• . return statement is used to terminate a function. But break statement is used to terminate a loop.

• . return statement is not allowed without function.

• . we can use multiple return statement in a function.

LIMITATION :

• return statement can not return more then one values in c, cpp, java.

• the default return type of a function in python is None.

• . in python return statement can return more then one value as tuple object.

• . return statement in python can return N no of values also N types of values.

. PACKING

• box = 10, 20, 30

. UNPACKING

by using index

x = box [ 0 ]

y = box [ 1 ]

z = box [ 2 ]

without using index

x , y , z = box

def bbsr () :
        print ( 'hi hi ')
        return 10, 20.12 , 1+2j , "india", [1,2,3]
        return 100
        print ( 'bye bye ')

def main () :

        k = bbsr ()
        print ( k , type ( k ) )

        box = bbsr ()
        a , b , c , d , e = box
        print ( box , type ( box ))
        print ( a , type ( a ) , b , type ( b ), c , d , e )

        a , b , c , d , e = bbsr ()
        print ( a , type ( a ) , b , type ( b ), c , d , e , type ( e ) )
main ()

Resources

1. Official Python Documentation: Functions

2. W3Schools' Python Tutorial: Functions

3. Scaler's Python Course: Functions

Goals for Tomorrow :

1. Explore something more on Functions.

2. what is Anonymous Function.

Conclusion :

Day 18’s a success!

What are your favorite Python resources? Share in the comments below.

Connect with me :

GitHub: [ github.com/p-archana1 ]

LinkedIn : [ linkedin.com/in/archana-prusty-4aa0b827a ]

Join the conversation :

Share your own learning experiences or ask questions in the comments.

HAPPY LEARNING!!

THANK YOU!!