Python Lambda

A lambda function in Python is a small anonymous function defined using the lambda keyword. It can take any number of arguments but can only have one expression.

1. Syntax

The basic syntax of a lambda function is:

lambda arguments: expression

2. Using Lambda Functions

Lambda functions are often used as a shortcut for simple functions where defining a full function using the def keyword is unnecessary.

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

3. Using Lambda with Built-in Functions

Lambda functions are commonly used with built-in functions like map(), filter(), and reduce().

numbers = [1, 2, 3, 4, 5]
squared = list(map(lambda x: x**2, numbers))
print(squared)

4. Limitations

While lambda functions are convenient for writing small, inline functions, they are limited to a single expression and cannot contain multiple statements or complex logic.

Conclusion

Lambda functions provide a concise way to define simple functions in Python. They are particularly useful in situations where you need a small anonymous function for a short period of time.