What is the purpose of the Python lambda function?

Lambda functions in Python are a type of anonymous function, also known as inline functions or anonymous functions. They are commonly used for writing simple, short functions to make the code cleaner and easier to read. Lambda functions are useful for a variety of purposes.

1. Streamline code: Using lambda functions can eliminate the need for defining separate functions, especially in cases where short functions need to be passed, reducing the amount of code.
2. Lambda functions can be passed as parameters to other functions, such as in higher-order functions like map(), filter(), and sorted().
3. Functional programming: Lambda functions can be used in conjunction with functional programming style, such as transforming and filtering lists through map() and filter().
4. Implement functions quickly: For certain simple functions, using lambda functions can achieve quicker implementation.

While lambda functions have the benefits mentioned above, they should be used cautiously as complex lambda functions can decrease the readability of the code. Generally, lambda functions are suitable for simple functionalities, while for complex logic, it is better to use regular named functions.