Python Tutorial

Introduction Python Features Python Applications Python System Requirements Python Installation Python Examples Python Basics Python Indentation Python Variables Python Data Types Python IDE Python Keywords Python Operators Python Comments Python Pass Statement

Python Conditional Statements

Python if Statement Python elif Statement Python If-else statement Python Switch Case

Python Loops

Python for loop Python while loop Python Break Statement Python Continue Statement Python Goto Statement

Python Arrays

Python Array Python Matrix

Python Strings

Python Strings Python Regex

Python Built-in Data Structure

Python Lists Python Tuples Python Lists vs Tuples Python Dictionary Python Sets

Python Functions

Python Function Python min() function Python max() function Python User-define Functions Python Built-in Functions Python Recursion Anonymous/Lambda Function in Python python apply() Function Python lambda() Function

Python File Handling

Python File Handling Python Read CSV Python Write CSV Python Read Excel Python Write Excel Python Read Text File Python Write Text File Read JSON File in Python

Python Exception Handling

Python Exception Handling Python Errors and exceptions Python Assert

Python OOPs Concept

OOPs Concepts in Python Classes & Objects in Python Inheritance in Python Polymorphism in Python Python Encapsulation Python Constructor Python Super function Python Static Method Static Variables in Python Abstraction in Python

Python Iterators

Iterators in Python Yield Statement In Python Python Yield vs Return

Python Generators

Python Generator

Python Decorators

Python Decorator

Python Functions and Methods

Python Built-in Functions Python String Methods Python List Methods Python Dictionary Methods Python Tuple Methods Python Set Methods

Python Modules

Python Modules Python Datetime Module Python Math Module Python Import Module Python Time Module Python Random Module Python Calendar Module CSV Module in Python Python Subprocess Module Python Subprocess

Python MySQL

Python MySQL Python MySQL Client Update Operation Delete Operation Database Connection Creating new Database using Python MySQL Creating Tables Performing Transactions

Python MongoDB

Python MongoDB

Python SQLite

Python SQLite

Python Data Structure Implementation

Python Stack Python Queue Python Linked List Python Hash Table Python Graph

Python Advance Topics

Speech Recognition in Python Face Recognition in Python Python Linear regression Python Rest API Python Command Line Arguments Python JSON Python Virtual Environment Type Casting in Python Python Collections Python Commands Python Data Visualization Python Debugger Python DefaultDict Python Enumerate

Python 2

What is Python 2

Python 3

Anaconda in Python 3 Anaconda python 3 installation for windows 10 List Comprehension in Python3

Misc

Python PPTX Python Pickle Python Seaborn Python Coroutine Python EOL Python Infinity Python math.cos and math.acos function Python Project Ideas Based On Django Reverse a String in Python Reverse a Number in Python Python Word Tokenizer Python Trigonometric Functions Python try catch exception GUI Calculator in Python Implementing geometric shapes into the game in python Installing Packages in Python Python Try Except Python Sending Email Socket Programming in Python Python CGI Programming Python Data Structures Python abstract class Python Compiler Python K-Means Clustering NSE Tools In Python Operator Module In Python Palindrome In Python Permutations in Python Pillow Python introduction and setup Python Functionalities of Pillow Module Python Argmin Python whois Python JSON Schema Python lock Return Statement In Python Reverse a sentence In Python tell() function in Python Why learn Python? Write Dictionary to CSV in Python Write a String in Python Binary Search Visualization using Pygame in Python Latest Project Ideas using Python 2022 Closest Pair of Points in Python ComboBox in Python Python vs R Best resources to learn Numpy and Pandas in python Check Letter in a String Python Python Console Python Control Statements Convert Float to Int in Python using Pandas Difference between python list and tuple Importing Numpy in Pycharm Python Key Error Python NewLine Python tokens and character set Python Strong Number any() Keyword in python Best Database in Python Check whether dir is empty or not in python Comments in the Python Programming Language Convert int to Float in Python using Pandas Decision Tree Classification in Python End Parameter in python __GETITEM__ and __SETITEM__ in Python Python Namespace Python GUI Programming List Assignment Index out of Range in Python List Iteration in Python List Index out of Range Python for Loop List Subtract in Python Python Empty Tuple Python Escape Characters Sentence to python vector Slicing of a String in Python Executing Shell Commands in Python Genetic Algorithm in python Get index of element in array in python Looping through Data Frame in Python Syntax of Map function in Python After Python What Should I Learn Python AIOHTTP Alexa Python Artificial intelligence mini projects ideas in python Artificial intelligence mini projects with source code in Python Find whether the given stringnumber is palindrome or not First Unique Character in a String Python Python Network Programming Python Interface Python Multithreading Python Interpreter Data Distribution in python Flutter with tensor flow in python Front end in python Iterate a Dictionary in Python Iterate a Dictionary in Python – Part 2 Allocate a minimum number of pages in python Assertion Errors and Attribute Errors in Python Checking whether a String Contains a Set of Characters in python Python Control Flow Statements *Args and **Kwargs in Python Bar Plot in Python Conditional Expressions in Python Function annotations() in Python How to Write a Configuration file in Python Image to Text in python import() Function in Python Import py file in Python Multiple Linear Regression using Python Nested Tuple in Python Python String Negative Indexing Reading a File Line by Line in Python Python Comment Block Base Case in Recursive function python ER diagram of the Bank Management System in python Image to NumPy Arrays in Python NOT IN operator in Python One Liner If-Else Statements in Python Sklearn in Python Cube Root in Python Python Variables, Constants and Literals What Does the Percent Sign (%) Mean in Python Creating Web Application in python Notepad++ For Python PyPi TensorFlow Python | Read csv using pandas.read_csv() What is online python free IDE What is Python online compiler Run exec python from PHP What are the Purposes of Python Python Ternary Operators Self in Python Python vs Java Python Modulo Python Packages Python Syntax Python Uses Python Bitwise Operators Python Identifiers Python Matrix Multiplication Python AND Operator Python Logical Operators Python Multiprocessing Python Unit Testing __init__ in Python Advantages of Python Is Python Case-sensitive when Dealing with Identifiers Python Boolean Python Call Function Python History Python Image Processing Python main() function Python Permutations and Combinations Difference between Input() and raw_input() functions in Python Conditional Statements in python Confusion Matrix Visualization Python Python Algorithms Python Modules List Difference between Python 2 and Python 3 Is Python Case Sensitive Method Overloading in Python Python Arithmetic Operators Assignment Operators in Python Is Python Object Oriented Programming language Division in Python Python exit commands Continue And Pass Statements In Python Colors In Python Convert String Into Int In Python Convert String To Binary In Python Convert Uppercase To Lowercase In Python Convert XML To JSON In Python Converting Set To List In Python Covariance In Python CSV Module In Python Decision Tree In Python Difference Between Yield And Return In Python Dynamic Typing In Python What is Python compiler GDB Python coding platform Python Classification Python | a += b is not always a = a + b PyDev with Python IDE Character Set in Python Best Python AI Projects _dict_ in Python

How to

How to Substring a String in Python How to Iterate through a Dictionary in Python How to convert integer to float in Python How to reverse a string in Python How to take input in Python How to install Python in Windows How to install Python in Ubuntu How to install PIP in Python How to call a function in Python How to download Python How to comment multiple lines in Python How to create a file in Python How to create a list in Python How to declare array in Python How to clear screen in Python How to convert string to list in Python How to take multiple inputs in Python How to write a program in Python How to compare two strings in Python How to create a dictionary in Python How to create an array in Python How to update Python How to compare two lists in Python How to concatenate two strings in Python How to print pattern in Python How to check data type in python How to slice a list in python How to implement classifiers in Python How To Print Colored Text in Python How to develop a game in python How to print in same line in python How to create a class in python How to find square root in python How to import numy in python How to import pandas in python How to uninstall python How to upgrade PIP in python How to append a string in python How to open a file in python How to Open a file in python with Path How to run a Python file in CMD How to change the names of Columns in Python How to Concat two Dataframes in Python How to Iterate a List in Python How to learn python Online How to Make an App with Python How to comment out a block of code in Python

Sorting

Python Sort List Sort Dictionary in Python Python sort() function Python Bubble Sort

Programs

Factorial Program in Python Prime Number Program in Python Fibonacci Series Program in Python Leap Year Program in Python Palindrome Program in Python Check Palindrome In Python Calculator Program in Python Armstrong Number Program in Python Python Program to add two numbers Anagram Program in Python Number Pattern Programs in Python Even Odd Program in Python GCD Program in Python Python Exit Program Python Program to check Leap Year Operator Overloading in Python Pointers in Python Python Not Equal Operator Raise Exception in Python Salary of Python Developers in India What is a Script in Python

Yield vs Return in Python

In this article, you will learn about " Yield " and " Return " in Python. You will also understand the difference between " Yield " and " Return " and the type of situations we handle using " Yield " and " Return ".

Let us understand the usage of both " Yield " and " Return " one by one.

What is " Return ", and why do we use it in Python?

Return is a statement that is used as a key component of functions in Python. It is generally used when the function sends the objects to the initial code. This is specified by the function’s return value. " return " statement is used in order to have an optimized code.

The " return " statement consists of a " return" keyword succeeded with a " return value ", which is generally not mentioned all the time. The " return value " can be any value, member of the code, variable, Python object etc. On the whole, the function can return an int value, float value, list objects, dictionary objects, tuple objects, modules, packages etc.   

If there is no return value given, then the function returns none. If the complete return statement is ignored, the function also returns none. In either case, the function returns none.

Syntax of " return " statement:

# define a function to insert a return statement
def function_name(arg1, arg2, arg3, ....):
    # statements ( if any )
    return return_value

A return statement that terminates the execution of a function immediately and returns to the return value is known as an " Explicit return statement ". Let us consider an example for understanding the concept of an " explicit return statement ".

A program that demonstrates " Explicit return statement  ":

# define a function in which an 
# explicit return statement must be declared
def function():
    # declare an explicit return statement
    return 5
# print the entire function, which leads to the output
print("The output of the above function which consists of the explicit return statement is:")
print(function())

The output of the above program:

The output of the above function, which consists of an explicit return statement, is:
5

An explanation for the above program and its output:

The only statement that is defined within the function " function() " is the " return statement ", and the execution of the function is terminated as soon as the return statement is entered. So, the return statement is considered to be an " Explicit return statement ", which satisfies the condition, i.e., the termination of the function execution after entering the return statement. In this way, we can verify whether the given return statement is explicit or not.

Let us consider another example regarding the " Explicit return statement ".

A program that demonstrates " Explicit return statement  " and operations being performed:

# define a function in which an 
# explicit return statement must be declared
def function():
    # declare an explicit return statement
    return 5
# assign the operation-related values to variables
a = function()*2
b= function()+6


# print the entire function, which leads to the output
print("The output of the above function which consists of the explicit return statement is:")
print(function())
print("The output of the function after being multiplied by 2 is:")
print(a)
print("The output of the function after being added to 6 is:")
print(b)

The output of the above program:

The output of the above function, which consists of an explicit return statement, is:
5
The output of the function after being multiplied by 2 is:
10
The output of the function after being added to 6 is:
11

Limitation of return statements:

  • The return statements must be written within the function body or the main body, or a method.
  • If the return statement is given outside the function body or the main body or a method, then the output of the program displays an error " SyntaxError ", denoting the return statement which is written outside the function body.

Let us see this with an example.

Program demonstrating the return statement being declared outside the method:

# declare a return statement without defining the function
return 5

The output of the program:

File "d:\downloads hdd\Java vs code programs\pythonpro.py", line 5
    return 5
    ^^^^^^^^
 SyntaxError: 'return' outside function

What is " Yield ", and why do we use it in Python?

The " yield " statement is a statement which suspends the execution of a specific function and sends a message to the caller mentioning the suspension of the function’s execution. If the caller desires to continue with the execution of the function, then he can resume the suspension at any time. When the function is resumed, then it starts from the point where it stopped or terminated before but not from the beginning.

Syntax of " return " statement:

# define a function to insert a yield statement
def function_name(arg1, arg2, arg3, ....):
    # statements ( if any )
    # yield statement
    yield value or expression

Advantages of yield in Python:

  • Code optimization
  • Can produce a sequence of values simultaneously
  • Helps in iterating over a sequence of values
  • Can initiate generator function

Let us understand the whole concept of yield using an example.

A program that demonstrates " yield statement  ":

# define a function in which 
# yield statement must be declared
def function():
    print("Started to use yield statement. The values are: ")
    # give a series of values using the yield statement
    yield 10
    yield 20
    yield 30
    yield 40
    yield 50
    yield 60
    yield 70
    yield 80
    yield 90
    yield 100


# for iteration of the values, use for loop
for x in function():
    print(x)

The output of the above program:

Started to use yield statement. The values are:
10
20
30
40
50
60
70
80
90
100

An explanation for the above program and its corresponding output:

As we have used the " yield " statements, the values have been iterated simultaneously just after giving a single command of the program line. If the " return " statement is used instead of the " yield " statement in the above program, it will not iterate the values like yield. It will just return the specified value, and the rest will wait for the function to return to them.

Let us look into the same example, which is replaced by a " return " statement.

A program that replaces " yield " with " return ":

# define a function in which 
# return statement must be declared
def function():
    print("Started to use return statement")
    # give a series of values using the return statement
    return 10
    return 20
    return 30
    return 40
    return 50
    return 60
    return 70
    return 80
    return 90
    return 100


# for iteration of the values, use for loop
for x in function():
    print(x)

The output of the above program:

Started to use the yield statement
Traceback (most recent call last):
  File "d:\downloads hdd\Java vs code programs\tut.py", line 18, in <module> 
    for x in function():
TypeError: 'int' object is not iterable

An explanation for the above program and its corresponding output:

As the given program contains a series of values, the return statement is not able to manage all the values. The " return " statement can only consider single values and cannot be iterable. We have also given iterable statements, which are against the policy of " return " statements. So, the output contained errors mentioning the iterable statements.

A program which demonstrates the suitable situations and usage of both yield and return statements:

# define a function to print the first 20 natural numbers
# in which yield and return statements must be declared
def function1():
    print("Started to use the yield statement")
    # give a series of values using the yield statement
    yield 1
    yield 2
    yield 3
    yield 4
    yield 5
    yield 6
    yield 7
    yield 8
    yield 9
    yield 10
    yield 11
    yield 12
    yield 13
    yield 14
    yield 15
    yield 16
    yield 17
    yield 18
    yield 19
    yield 20


def function2():
    print("Started to use the return statement")
    a = "The first 20 natural numbers are listed below:"
    return a


# firstly, print the data embedded in function2() to use the return # statement
print(function2())


# for the iteration of the values 
# to print the first 20 natural numbers,
# use for loop


for x in function1():
    print(x)

The output for the above program:

Started to use the return statement
The first 20 natural numbers are listed below:
Started to use the yield statement
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20



ADVERTISEMENT
ADVERTISEMENT