In Python we have many built-in functions like print() , len() but we can define our own reusable functions which can perform user defined set of operations.
How to define a function:
- function definition starts with def keyword and followed by function name & ()
- Within the () we write the input parameters.
- Followed by : and indentation , we should avoid wrong indentation to avoid code error.
- end with an optional return statement to return the values from where the function was called , this also exists the function.
Below is an example in the form of code.
Lambda Expression/Functions (Anonymous Functions):
- This type functions does not have any names and does not start with def keyword.
- Lambda functions takes any number of arguments and returns only one value in the form of expression.
- This function will have only one line.
- Syntax – lambda arguments: expression
- Lambda functions are used in combination with in built map & filter functions.
- Also used in sorting operations.
Now lets look at examples in code & see how to use Lambda expression/functions –
In Maps and filters , we can use other in built or user defined functions.
