Python Tutorials

Python - Lambda Functions

Lambda Functions in Python

Python lambda functions are small, anonymous functions defined with the lambda keyword. They can have any number of arguments, but can only have one expression or return statement. Lambda functions are often used when a basic function is needed for a short period.

Define a Lambda Function

You can define a lambda function using the lambda keyword such as:

lambda arguments: expression

Example

This is an example of the lambda function, here we return the sum of two numbers.

add = lambda x, y: x + y
print(add(5, 3)) # Output: 8

The above example uses the keyword 'lambda' to define a lambda function, then passes two arguments x and y. Then we return the sum of these numbers.

Why we use the Lambda Function

The lambda function in Python is an anonymous function:- A function without a name. It is used for small, simple operations where defining a full 'def' function would be overkill.

A lambda function is used to create simple expressions. For example, expressions that do not include complex structures such as if-else, for-loops, and so on. Here are a few reasons why we use lambda functions:

Concise

The lambda function allows you to create a short, and readable code, especially for simple operations.

square = lambda x: x ** 2
print(square(4))  # Output: 16

Used as an Inline Function

This function is commonly used where a function is required temporarily, especially with functions like map(), filter(), and reduce().

numbers = [1, 2, 3, 4]
squares = list(map(lambda x: x ** 2, numbers))
print(squares)  # Output: [1, 4, 9, 16]

Functional Programming

Lambda functions are often used in functional programming paradigms where we pass functions as arguments.

def apply_function(func, value):
    return func(value)

print(apply_function(lambda x: x + 5, 10))  # Output: 15

Simplifies Code in Callbacks

Useful in scenarios like GUI programming or event handling where you need to pass small functions as arguments.

button.on_click(lambda: print("Button clicked!"))

Limitations of Lambda Functions

  • Single Expression Only: Lambda can only contain a single expression, not multiple statements.
  • Readability: Overusing lambda functions can make the code difficult to understand.
  • No Annotations: We can't add type annotations or docstring to lambda.

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Python

Beginner 5 Hours

Lambda Functions in Python

Python lambda functions are small, anonymous functions defined with the lambda keyword. They can have any number of arguments, but can only have one expression or return statement. Lambda functions are often used when a basic function is needed for a short period.

Define a Lambda Function

You can define a lambda function using the lambda keyword such as:

python
lambda arguments: expression

Example

This is an example of the lambda function, here we return the sum of two numbers.

python
add = lambda x, y: x + y
print(add(5, 3)) # Output: 8

The above example uses the keyword 'lambda' to define a lambda function, then passes two arguments x and y. Then we return the sum of these numbers.

Why we use the Lambda Function

The lambda function in Python is an anonymous function:- A function without a name. It is used for small, simple operations where defining a full 'def' function would be overkill.

A lambda function is used to create simple expressions. For example, expressions that do not include complex structures such as if-else, for-loops, and so on. Here are a few reasons why we use lambda functions:

Concise

The lambda function allows you to create a short, and readable code, especially for simple operations.

python
square = lambda x: x ** 2
print(square(4))  # Output: 16

Used as an Inline Function

This function is commonly used where a function is required temporarily, especially with functions like map(), filter(), and reduce().

python
numbers = [1, 2, 3, 4]
squares = list(map(lambda x: x ** 2, numbers))
print(squares)  # Output: [1, 4, 9, 16]

Functional Programming

Lambda functions are often used in functional programming paradigms where we pass functions as arguments.

python
def apply_function(func, value):
    return func(value)

print(apply_function(lambda x: x + 5, 10))  # Output: 15

Simplifies Code in Callbacks

Useful in scenarios like GUI programming or event handling where you need to pass small functions as arguments.

python
button.on_click(lambda: print("Button clicked!"))

Limitations of Lambda Functions

  • Single Expression Only: Lambda can only contain a single expression, not multiple statements.
  • Readability: Overusing lambda functions can make the code difficult to understand.
  • No Annotations: We can't add type annotations or docstring to lambda.

Related Tutorials

Frequently Asked Questions for Python

Python is commonly used for developing websites and software, task automation, data analysis, and data visualisation. Since it's relatively easy to learn, Python has been adopted by many non-programmers, such as accountants and scientists, for a variety of everyday tasks, like organising finances.


Python's syntax is a lot closer to English and so it is easier to read and write, making it the simplest type of code to learn how to write and develop with. The readability of C++ code is weak in comparison and it is known as being a language that is a lot harder to get to grips with.

Learning Curve: Python is generally considered easier to learn for beginners due to its simplicity, while Java is more complex but provides a deeper understanding of how programming works. Performance: Java has a higher performance than Python due to its static typing and optimization by the Java Virtual Machine (JVM).

Python can be considered beginner-friendly, as it is a programming language that prioritizes readability, making it easier to understand and use. Its syntax has similarities with the English language, making it easy for novice programmers to leap into the world of development.

To start coding in Python, you need to install Python and set up your development environment. You can download Python from the official website, use Anaconda Python, or start with DataLab to get started with Python in your browser.

Learning Curve: Python is generally considered easier to learn for beginners due to its simplicity, while Java is more complex but provides a deeper understanding of how programming works.

Python alone isn't going to get you a job unless you are extremely good at it. Not that you shouldn't learn it: it's a great skill to have since python can pretty much do anything and coding it is fast and easy. It's also a great first programming language according to lots of programmers.

The point is that Java is more complicated to learn than Python. It doesn't matter the order. You will have to do some things in Java that you don't in Python. The general programming skills you learn from using either language will transfer to another.


Read on for tips on how to maximize your learning. In general, it takes around two to six months to learn the fundamentals of Python. But you can learn enough to write your first short program in a matter of minutes. Developing mastery of Python's vast array of libraries can take months or years.


6 Top Tips for Learning Python

  • Choose Your Focus. Python is a versatile language with a wide range of applications, from web development and data analysis to machine learning and artificial intelligence.
  • Practice regularly.
  • Work on real projects.
  • Join a community.
  • Don't rush.
  • Keep iterating.

The following is a step-by-step guide for beginners interested in learning Python using Windows.

  • Set up your development environment.
  • Install Python.
  • Install Visual Studio Code.
  • Install Git (optional)
  • Hello World tutorial for some Python basics.
  • Hello World tutorial for using Python with VS Code.

Best YouTube Channels to Learn Python

  • Corey Schafer.
  • sentdex.
  • Real Python.
  • Clever Programmer.
  • CS Dojo (YK)
  • Programming with Mosh.
  • Tech With Tim.
  • Traversy Media.

Python can be written on any computer or device that has a Python interpreter installed, including desktop computers, servers, tablets, and even smartphones. However, a laptop or desktop computer is often the most convenient and efficient option for coding due to its larger screen, keyboard, and mouse.

Write your first Python programStart by writing a simple Python program, such as a classic "Hello, World!" script. This process will help you understand the syntax and structure of Python code.

  • Google's Python Class.
  • Microsoft's Introduction to Python Course.
  • Introduction to Python Programming by Udemy.
  • Learn Python - Full Course for Beginners by freeCodeCamp.
  • Learn Python 3 From Scratch by Educative.
  • Python for Everybody by Coursera.
  • Learn Python 2 by Codecademy.

  • Understand why you're learning Python. Firstly, it's important to figure out your motivations for wanting to learn Python.
  • Get started with the Python basics.
  • Master intermediate Python concepts.
  • Learn by doing.
  • Build a portfolio of projects.
  • Keep challenging yourself.

Top 5 Python Certifications - Best of 2024
  • PCEP (Certified Entry-level Python Programmer)
  • PCAP (Certified Associate in Python Programmer)
  • PCPP1 & PCPP2 (Certified Professional in Python Programming 1 & 2)
  • Certified Expert in Python Programming (CEPP)
  • Introduction to Programming Using Python by Microsoft.

The average salary for Python Developer is ₹5,55,000 per year in the India. The average additional cash compensation for a Python Developer is within a range from ₹3,000 - ₹1,20,000.

The Python interpreter and the extensive standard library are freely available in source or binary form for all major platforms from the Python website, https://www.python.org/, and may be freely distributed.

If you're looking for a lucrative and in-demand career path, you can't go wrong with Python. As one of the fastest-growing programming languages in the world, Python is an essential tool for businesses of all sizes and industries. Python is one of the most popular programming languages in the world today.

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