What is first class object in python?

In python, functions are first class objects in python.

Advantages of first class objects:

• We can treat functions like other normal objects like int, string, list etc
• We can pass functions as another function arguments, return a function in another function and assign a function to another variable
• Define a function within a function (Inner functions)
• This first class object plays a key role in python for decorator design pattern.

Examples:

# Simple function for adding two numbers def add_num(num1, num2): return num1 + num2 # Passing function as a first argument def add_values(fun, arg1, arg2): result = fun(arg1, arg2) return result 

• Assigning function name to the variable:

fun = add_num 

• Passing function as a parameter

two_num_sum = add_values(fun, 5, 8))