Python Coding challenge - Day 1289| What is the output of the following Python Code?

Code Explanation:

1. Importing lru_cache

from functools import lru_cache

- Imports lru_cache from Python’s built-in functools module.

- It allows a function to store previously computed results and reuse them when called with the same arguments.

2. Applying the Cache Decorator

@lru_cache(None)

- Applies caching to the function defined below it.

- None means there is no maximum limit on the number of cached results.

- If the function receives the same argument again, Python returns the cached result instead of executing the function body again.

3. Defining the Function

def f(x):

- Defines a function named f.

- The parameter x receives the value passed during the function call.

- In this example, x receives the value 3.

4. Printing Without a New Line

print(x, end="")

- Prints the value of x, which is 3.

- end="" prevents Python from adding a newline after printing.

- This statement executes only when the function body runs, not when a cached result is returned.

5. Returning the Calculated Value

return x * 2

- Multiplies x by 2.

- Since x = 3, the function returns 6.

- The caching decorator stores this result for the argument 3.

6. Calling the Function Twice

print(f(3) + f(3))

- The first f(3) executes the function, prints 3, and returns 6.

- The second f(3) uses the cached result 6, so the function body does not execute again.

- Python adds the returned values: 6 + 6 = 12.

- The outer print() displays 12 immediately after the previously printed 3.

Final Output

312

Books: 400 Days Python Coding Challenges with Explanation