Python Coding challenge - Day 1115| What is the output of the following Python Code?

 

Code Explanation:

🔹 1. Defining the Decorator Function

def deco(func):

👉 This defines a decorator function named deco

👉 It takes another function func as input

🔹 2. Creating the Wrapper Function

    def wrapper():

👉 Inside deco, we define a nested function called wrapper

👉 This function will modify or extend the behavior of func

🔹 3. Calling Original Function + Modifying Output

        return func() + 1

👉 func() → calls the original function

👉 + 1 → adds 1 to its result

💡 So this decorator increases the return value by 1

🔹 4. Returning the Wrapper

    return wrapper

👉 Instead of returning the original function,

👉 we return the modified version (wrapper)

🔹 5. Applying the Decorator

@deco

👉 This is syntactic sugar for:

f = deco(f)

👉 It means:

pass function f into deco

replace f with wrapper

🔹 6. Defining the Original Function

def f():

    return 5

👉 This function simply returns 5

🔹 7. Calling the Function

print(f())

👉 Actually calls wrapper() (not original f)

👉 Inside wrapper:

func() → returns 5

+1 → becomes 6

✅ Final Output

6

Book:  500 Days Python Coding Challenges with Explanation