What is the difference between lambda expressions and anonymous functions?

Lambda expressions and anonymous functions are both ways to create anonymous functions in Python, but there are differences. Assignment method: lambda expression returns a function, and anonymous functions must be assigned to variables to be used. Code complexity: A lambda expression can only contain one expression, while an anonymous function can contain multiple statements.

Lambda Expressions vs. Anonymous Functions: Exploring the Differences

Introduction

In programming, lambda expressions and anonymous functions are often used interchangeably, but there are subtle differences between the two. This article will dive into the differences between the two and demonstrate their usage with practical examples.

lambda expression

lambda expression is a shorthand syntax in Python for defining anonymous functions. They are typically used to create small, one-time use functions. The syntax of lambda expression is as follows:

lambda arguments : expression

where:

• arguments is the parameter list of the function
• expression Is the code to be executed

Anonymous function

Anonymous function is a function that lacks a name. They are defined using the def keyword, followed by function parameters and code blocks. The syntax of anonymous functions is as follows:

def (arguments) :
    # 函数体

Difference

The main difference between lambda expressions and anonymous functions is the assignment method:

• lambda expression: is not assigned to a variable, but is returned as the result of the expression.
• Anonymous function: Must be assigned to a variable to be used.

In addition, a lambda expression can only contain one expression, while an anonymous function can contain multiple statements.

Practical case

The following is an example comparing lambda expressions and anonymous functions:

lambda expression:

lambda x: x**2

Anonymous function:

def square(x):
    return x**2

Both functions calculate the square of a number. However, lambda expressions return a function, while anonymous functions return nothing.

Conclusion

Lambda expressions and anonymous functions are both powerful tools for creating one-time use functions. It's crucial to understand the differences between the two in order to use them effectively in your code.

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