What is Lambda in Python [Explain With an Example]

In Python, lambda is a keyword used to define anonymous functions, also known as lambda functions.

A lambda function is a small, single-expression function that doesn’t have a name and is defined inline.

It is commonly used when you need a simple function for a short period and don’t want to define a separate named function.

The general syntax of a lambda function is as follows:

lambda arguments: expression

Here, arguments are the input parameters of the function, and expression is the computation or operation that the function performs. The lambda function takes the arguments, applies the expression to them, and returns the result.

Here’s an example to illustrate the usage of lambda:

# Example 1: Squaring a number
square = lambda x: x ** 2
print(square(5))  # Output: 25

# Example 2: Adding two numbers
addition = lambda a, b: a + b
print(addition(3, 4))  # Output: 7

# Example 3: Checking if a number is even
is_even = lambda num: num % 2 == 0
print(is_even(6))  # Output: True
print(is_even(7))  # Output: False

In the first example,

The lambda function square takes a single argument x and returns the square of x. When called with square(5), it returns the result 25.

In the second example,

The lambda function addition takes two arguments a and b and returns their sum. When called with addition(3, 4), it returns the result 7.

In the third example,

The lambda function is_even takes a single argument num and checks if it is even by performing the modulus operation (num % 2 == 0). When called with is_even(6), it returns True, indicating that 6 is an even number.

Lambda functions are often used in conjunction with higher-order functions like map(), filter(), and reduce() to provide a concise way of defining simple functions on the fly.

What is the common use of lambda in Python?

The common use of lambda in Python is to create small, anonymous functions that are used as arguments to higher-order functions or in situations where defining a separate named function would be unnecessary or cumbersome.

It allows you to create functions on the fly without the need for a formal function definition.

What is the use of the Lambda function?

The primary use of a lambda function is to define a small, single-expression function without a name. It is often used in functional programming paradigms where functions are treated as first-class citizens.

Lambda functions are commonly used with higher-order functions like map(), filter(), and reduce() to perform operations on iterable data structures.

What is the difference between lambda and Python?

It seems you are asking about the difference between the lambda keyword in Python and the programming language itself.

lambda is not a different programming language; it is a feature of the Python programming language.

Python supports the use of lambda functions as a way to define anonymous functions.

So, the difference between lambda and Python does not exist in that sense.

What is a lambda What is its advantage in Python?

A lambda function, as explained earlier, is a way to define anonymous functions with a concise syntax. Its advantages in Python are:

  • Conciseness: Lambda functions allow you to define simple functions in a single line of code without the need for a formal function definition.
  • Readability: Lambda functions can make code more readable when used appropriately, especially for small, straightforward operations.
  • Flexibility: Since lambda functions are anonymous, they can be used in situations where a named function would be overkill or create unnecessary clutter.
  • Higher-order functions: Lambda functions are commonly used with higher-order functions, allowing for more expressive and functional programming-style code.
  • Convenience: Lambda functions can be defined and used inline without the need to assign them to a variable or give them a name, making them convenient for short-lived functions.

However, it’s worth noting that lambda functions have limitations compared to named functions. They can only contain a single expression and are often used for simple operations.

For more complex functions, it is generally recommended to use a named function definition for better maintainability and readability.

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  • Yaryna Ostapchuk

    I am an enthusiastic learner and aspiring Python developer with expertise in Django and Flask. I pursued my education at Ivan Franko Lviv University, specializing in the Faculty of Physics. My skills encompass Python programming, backend development, and working with databases. I am well-versed in various computer software, including Ubuntu, Linux, MaximDL, LabView, C/C++, and Python, among others.

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