Day 19 Guide: How to Master Anonymous and Generator Functions in Python

Introduction :

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

Today, I dove into Anonymous and Generative function, Let's explore what I learned!

Anonymous Function :

some time we can declare a function without any name, and this type of nameless function is known as anonymous function / lambda function / generator function .

the main purpose of anonymous function is just instant use .

in python function is basically two types.

. STANDARD FUNCTION

. LAMBDA FUNCTION

C++ / Java anonymous object : THE OBJECT HAVING NO ANY NAME

def standardHello () : return 'hello sir i am standard function !'
        return 'hello sir i am standard function !'

lambdaHello = lambda :  'hello sir i am lambda function !'

print ( standardHello () )
print ( lambdaHello () )

lambda Function :

we can define by using lambda keyword .

syntax :

lambda argument list : expression by default it return value , do not write return key word inside lambda function .

Example :

Write a program to create lambda function to find square of given number

lambda n : n* n
print ("the square of 4 is ", s(4))
print ("the square of 5 is ", s(5))

write a program to create a lambda function to find sum of two number

s= lambda a, b :a+b
print ("sum of 10,20 are ", s(10,20))

write a lambda function to get max between two number

s= lambda a, b: a if a> b else b  
print ("max of two number is", s(10,20))

Function Recursion

A function that calls itself is known as Recursive Function

example:

def Main () : #function defination
    print ("i am a recursion function")
    Main () #function  calling  itself

Main () #function calling

GENERATOR FUNCTION :

Generator is a function which is responsible to generate a sequence of values

. if a function contains yield keyword that function is known as generator function.

. the default return type of generator function it not None

. the default return type of generator function is a generator object.

. to fetch the value from generator object we have to use next () predefined function.

. if we will apply next () after fetching all values it will raise StopIteration exception.

def channelGenerator () :
        subchlist = [ 'start sports', 'max', 'sony', 'nd tv', 'discovery' ]
        for channel in subchlist :
                yield channel

remote = channelGenerator ()
print ( next ( remote ) )
print ( next ( remote ) )
print ( next ( remote ) )
print ( next ( remote ) )
print ( next ( remote ) )
print ( next ( remote ) )

The main advantages of recursive functions are:

1. We can reduce length of the code and improves readability

2. We can solve complex problems very easily.

Q. Write a Python Function to find reverse of given number with recursion

Q. Write a Python Function to find sum of digit of given number with recursion

Q. Write a Python Function to find factorial of given number with recursion

Challenges :

1. Understanding various types of functions .

2. Handling errors.

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. that is type of arguments .

Conclusion :

Day 19’s a success!

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

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GitHub: [ https://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!!